Showing posts with label Isaac Asimov. Show all posts
Showing posts with label Isaac Asimov. Show all posts

Friday, July 17, 2020

Look Out For Naked Eye Comet Neowise - But It's No Harbinger Of Doom

Comet NEOWISE (C/2020 F3) became part of the summer landscape at dawn on July 8, 2020 near Duluth, Minnesota. Details: 100-mm lens, f/2.8, ISO 400, 4-second exposure.
Comet Neowise seen soon after sunset .

A week ago, the buzz started: stargazers, amateur astronomers and comet-hunters have been going crazy about Comet NEOWISE, the brightest comet in seven years.   It is interesting  that now - in the midst of a global pandemic - a comet makes an appearance, and a naked eye -visible comet at that.   

From time immemorial comets have been regarded as portents of doom, or some limited natural catastrophe.  That only began to change when astronomers developed the sophisticated instruments and techniques which revealed them to be just other members of the solar system - but which traveled in much more elliptical orbits then the planets.  But I have no worries this minor comet will incite any hysteria.  It would need to be roughly 3 apparent magnitudes brighter, e.g.


And some 5 arc degrees longer. See:  Measuring Angular Distances In Astronomy

What then is a comet? It is basically an immense  "dirty snowball"  as long time science writer Isaac Asimov once described  it.  The ices (snowball part) are of water, ammonia and methane - which are embedded within rocky material . As a comet nears the Sun the icy material evaporates, forming the coma: a cloud of mostly gas and some admixture of dust.  As the ice evaporates the radiation pressure of the solar wind forces the comet to form a 'tail' directed away from the Sun.    Spectroscopy shows the tail comprised of two parts: a dust tail and an ion tail. The former shows a spectrum of sunlight reflected from dust expelled out of the coma.  The latter displays a spectrum with emission lines  - indicating it is an ionized plasma.  The ion tail's spectrum shows gases such as carbon monoxide, carbon dioxide and molecular nitrogen (N2).

The size of comets varies considerably, some with diameters of 180,000 km to ass small as 15,000 km across. The larger the diameter the greater the chance for a remarkable, bright comet.  The length of the tail varies tremendously as well, the longest ever recorded being the comet of 1843  - with a tail 200 million miles long, or more than twice the distance of the Earth from the Sun.

The latest visible comet appeared a few weeks ago in the pre-sunrise eastern sky. Now, however, it has made the  transition to becoming an easy-to-see naked eye object in the far more convenient post-sunset northwestern night sky. 
Officially designated C/2020 F3, Comet NEOWISE (named for the NASA infrared space telescope that discovered it on March 27, 2020) has been falling toward the Sun for more than 3,000 years, and on July 3rd  passed just 27.4 million miles from the Sun—inside the orbit of Mercury.
It’s now fading slightly as it exits the Solar System, though since it’s getting slightly closer to Earth, it ought to remain relatively bright for a while yet. Comet NEOWISE actually gets closest to Earth on July 23, 2020, when it will be 64 million miles distant.

According to Sky & Telescope magazine, you should start looking about 1 hour after sunset, when you’ll find it just over the northwest horizon as the last of twilight fades into darkness. “Look about three fists below the “bowl” of the Big Dipper, which is hanging by its handle high above, and perhaps a little to right,” said the magazine. 

It advises you locate it by first noting the two stars at the bottom of the Big Dipper’s bowl. Then draw an imaginary line through them and toward lower left to a point in the sky a little more than one fist away.  (See again the above link to 'measuring angular distances in astronomy').
Bob King has written an excellent Comet NEOWISE spotter’s guide on Sky & Telescope, which I urge all interested readers  to check it out. I plan to have my binoculars ready just after sundown tonight. (Barring any T-storms!)

This Sky & Telescope chart shows the appearance of Comet NEOWISE on the evenings of July 14–23.

Monday, July 8, 2019

The Reasons For The "Millennial Baby Bust" Are Not Difficult To Grasp

Denver traffic
A sign of the increasing population times: Traffic on I-25  near Denver. Colorado's population has doubled in the past 25 years. Most of the drivers shown here are Millennials.

True to form, and like a broken clock that's correct twice each day, the WSJ editorial writers did at least get  two things tagged correctly in their editorial ('America's  Millennial Baby Bust',  May 29, p. A14).  Which isn't saying a lot given they addressed about 7 items.  Before examining the major issues they flubbed, let's look at what they got right:

1)"Declining U.S. birth rates are the product of large cultural forces that the federal government can't buy off with subsidies and income transfers."

This is true because too many (upwards of 30 million) would have to be bought off. Facing a $22 trillion national debt such a buyoff simply would not be financially (or politically) feasible.

2) "The evidence from around the world  is that pro-natalist policies can't offset these cultural trends. Singapore's fertility rate has declined since the 1990s to about 1.2 even after decades of government payouts to encourage more children."

The editorial then cites similar stats  from Japan.

Where the editors slid off the rails is when they whined:

"The theory is that it's too expensive to raise children and thus government must subsidize families. The left wants universal child care, paid parental leave, a larger child tax credit.  A faction of the right supports much of that agenda and payments for women who exit the labor force to have children."

First, it IS too expensive for most middle class citizens - millennials or other - to have children. We are talking about $274,000 on average to raise one kid to college graduation stage.   Even to just high school graduation, $220,000 is a conservative estimate.  But the editors conflate two factors here: subsidizing children and parents as a moral decision of a government, and subsidizing baby making.

In a culture in which a never- ending war is fought over abortion it should not be necessary to point out that the "agenda" both of the left (and most of the right) ought to be a no -brainer. That is, only IF a government does do these things can one aver it is seriously interested in tending to the welfare of life AFTER BIRTH..  Then such policies could be seen as real and viable as opposed to the make believe farrago of BS trotted out by Naomi Schaefer Riley in her recent WSJ op-ed "Christians Are Pro-Life After Birth Too.".  Therein citing a few specialized examples of Christian care (i.e. in foster homes, adoptions) as if these constitute universal policies - say paid parental leave, and fully subsidized child care for working parents.

This is important because Rightist Christians, especially the Evangelicals, are among the most belligerent anti-abortion warriors - but among the most miserly in protecting and nurturing life after birth .  So if you as a Christian would have me believe you  are truly "pro life after birth" I want to see you go whole hog in for the higher taxes to support that agenda the WSJ rejects.  And again, this is a separate issue from millennials not having kids.

The biggest reasons for the latter are: 1) the crushing student loan debt, now over $1. 6 trillion and 2) the lack of decent paying jobs to cover (1) as well as afford housing.  In Denver now the median home price is $584,000 and a person (couple) that wants such a home would have to earn at least $90,000 a year to have enough left over - say to raise a kid, pay utilities, groceries, other bills.  In Colorado Springs, the median home price has now spiked to $490,000. Meanwhile, the average employee here in the Springs earns $20.50 an hour.  This isn't even enough to pay for most rents, now averaging just over $1,000 a month.

Now for a personal face on it: A young woman (Hannah Moore) featured in yesterday's Denver Post Business section (p. 1K, 3K) admits she's "worked continuously" since 2007 when she graduated college, and can't afford enough for a mortgage down payment. According to the story:

"About half her income, she calculates, is eaten up by rent, health insurance and student loan payments...of $850 a month."

And Ms. Moore is one of the lucky ones.  At least she can afford to pay off $850 a month in student loan debts. Many can't and either have to settle for a minimum, say $200 a month, or joining a new movement to deliberately default on their accumulated debt.  This will likely wreck their credit forever, or at least long enough to limit their job choice which - even if they get them - will see wages confiscated.

Meanwhile we are informed ('What The Student Loan Debt is Doing To The U.S. Economy'  (June 25, WaPo):

"Researchers need to account for the across the board wage stagnation that's happened since the 1970s."

I'd say it's fairly straightforward if people are willing to open their eyes to the 800 -pound "gorilla" sitting in the room.  That is the explosion in human population. Look, since 1972 the global population has doubled to 7.3 billion and change.  As I pointed out in a previous post (July 3rd), the U.S. population has itself increased by 45 million  since 2000.  Those are 45 million people - hitting age 19 now-   who will need jobs, homes, health care providers, resources - and most of which aren't there.  Colorado alone has doubled its population in 25 years turning our traffic into nightmares (see graphic) and making competition for jobs and homes downright brutal. This state isn't alone, either. Florida has doubled its population twice since 1972.

The results?  The added numbers of job seekers to Colorado represent a supply that can't be accommodated given the kinds of jobs they seek:  mainly IT, MJ specialists or related tech. And they will not take the jobs (especially after graduating with a B.Sc. or B.A.)  that are going begging. Like picking crops of  peaches, strawberries, watermelons or cleaning school gyms.  So, in effect, a large elite labor surplus has been created, from which the tech employers can pick and choose-  and dismiss. 

This upper tier labor surplus ensures corporate employers have zero pressure on them to offer higher wages.   In the words of Adam Gadomski of Aspen Advisers - quoted in one WSJ piece from two years ago-  explaining why so many corporate employers aren't hiring top talent with pay commensurate:

"When companies lament they can't find workers to fill key openings, that is code for: "I can find talent, I just don't want to pay them as much as they cost."


Why would they when they can always find a 'next in line'  (e.g. in the techie labor surplus)  who will accept lower pay, fewer benefits?    Thus the fierce competition for scarce, better quality jobs is ultimately driving many seekers away disheartened.  Because, of course, they can't indefinitely continue to work two jobs - say one at Arby's  and  driving for  Lyft evenings - while paying $1300- 1600 a month rent.

Now, seriously, do you think they can also afford to have kids in this milieu? Of course not.

The home building also isn't keeping pace with the population growth. According to the state demographer Elizabeth Garner, there are fewer new (rental) units than in the past despite the fact that housing construction hasn't picked up since the Great Recession.  According to Garner, quoted in the Denver Post:

"Even though people think we're doing a lot of building it's not as much as they think we are."


The lack of housing, creating a shortage of supply, has radically driven up costs even forcing many who've moved to Denver to now look for housing 67 miles away here in Colorado Springs. So now our housing prices are shooting up too. We regularly receive up to two notices a week from realtors begging to buy our place "on the spot, hard cash".  Of course, we just laugh and tear them up.  As our Springs housing fills up the Denver workers are even being chased as far south as Pueblo to try to find affordable homes . And as they put pressure on the market there with their demand (and again limited supply) the housing prices again shoot up.

Nor is this problem confined to the U.S. As we have recently learned (WSJ, 'Affordable Housing Grows as Global Issue', April 3, p. B5):

"Across 32 major cities around the world, real home prices on average grew 24 % over the past five years, while average real income grew by only 8 percent over the same period."

Too many people!  Add the costs of living (homes, rents, medical care) to the numbers competing for the same limited resources such as lumber (growing ever scarcer) and you have a nightmare, e.g.


Therein, the Earth overshoot (of consumption of planetary resources)  is the basic basis for the "Affordable home bust" as well as the  "Millennial Baby Bust".  And look, don't listen to the Pollyannas  (like Prof. Steven Pinker) because it isn't going to get better.  That much we know.  Barring a massive effort to control births worldwide (no more than 8 b people by 2050)  the resource depletion, crops depletion, wars and extreme inequality that incites them will just keep getting worse.  And the risk of a deadly pandemic like Spanish flu in 1918 culling human  numbers,  also increases.  Which is just a takeoff on Isaac Asimov's theme when he delivered a lecture in Barbados back in 1976,

 i.e. that "if humans can't control their numbers then nature will do it for us."

The formula is straightforward: More humans =   more crowding, more traffic, more CO2 pollution and greenhouse warming, more consumption of water, timber, fuel, and LESS space for other life forms, as well as quality living space to share.  Asimov's conclusion was that Earth's carrying capacity was 3 billion, and we have already surpassed that by 4.3 billion.

The projections now are for at least 10 billion people by 2050, and an 80 percent probability of 12.3 billion on Earth by 2100. Simply put, there simply aren't the resources to support even the lower addition. At root, the issue is sustainability - especially for water which is needed for crops. NO water, no crops to feed a growing population.   With 2.5 billion more humans set to arrive by 2050 where will the added people go? Where will the affordable homes, or food or medical care - not to mention living space - come from ?  The jobs?  The water?  No one has a clue and that future is barely 30 years away, a literal blink.

Regarding  fresh, potable water, we learned in today's WSJ (p. A8):

"By 2030  demand for water in India will be double the country's supply."

And this is twenty years short of the additional half billion people India will likely have by 2050.

But what do the WSJ editors offer instead of hard analyses? Well, more codswallop and distractions, excuses that fit into their capitalism uber alles narrative.  Writing, for example (ibid.), as another "reason" for the Millennial baby bust:

"More women want to find fulfillment in professional work, a strong social force that won't be mitigated by a monthly check if they stay home."

While such fulfillment can't be summarily dismissed it still only accounts for about 30 percent of the failure to start families.  The much bigger reason-  according to the Fed's and other stats (e.g. from the Economy Policy Inst.)-  is not enough income to purchase an affordable home.  Which can then be traced inexorably to the stiff competition arising from ....you guessed it... too many people competing for the existing homes, jobs.

This leads us to ask why it is that excess population is not given more play in the media.   I offered an answer in my May 11 post from last year when I pointed out:

"The hedge funds and corporations that own the newspapers and run the boards of directors are in thrall to consumption and ever more debt.  If they spilled the beans about too many people already, they'd have to admit to their agenda of not only exploding population and exploding consumption but exploding debt. Already, consumer debt of all types (including student loan debt) in the U.S. has hit $15 trillion.   The increasing debt itself is a pronounced signal that things cannot go on as they are, e.g.
http://brane-space.blogspot.com/2013/09/44-trillion-in-deficits-by-2024-minus.html

In an article appearing in `Physics Today' (July, 2004 issue): `Thoughts on Long-Term Energy Supplies: Scientists and the Silent Lie', Prof. Albert Bartlett (Univ. of Colorado-Boulder) pinpointed the failure to name human population growth as a major cause of our energy and resource problems.


Bartlett asserted that "their (scientists') general reticence stems from the fact that it is politically incorrect or unpopular to argue for stabilization of population - at least in the U.S. Or perhaps scientists are uncomfortable stepping outside their specialized areas of expertise".

Bartlett himself, in one magnificent lecture, i.e.


https://www.youtube.com/watch?v=kZA9Hnp3aV4

 Has perhaps given the best reason for this reticence of scientists to speak out: the realization that too few Americans understand the concept of exponential increase which lies at the heart of population increase.  The problem here is that if scientists, e.g. physicists, aren't willing to come forward and call out population growth as a key culprit in our wage stagnation,  planetary degradation and economic morass then few others will.  Interestingly, Bartlett echoes Asimov in his lecture - 17:20 mark on - in noting everything that makes the population problem better are things we are desperate to avoid, i.e. war, disease, famine, accidents, abortion etc.  And all the things that make the population problem worse (more people)  we are for.  (But as he notes, ultimately nature will decide from the former list to limit our numbers if we don't.)


Personally, I suspect another huge reason the Millennials aren't churning out babies is because they relate more intimately to the planetary disruption and damage our numbers have caused. In everything from destroying the oceans, e.g. via warmer temperatures and higher acidification, to the proliferation of plastics, e.g

No photo description available.
 To polluting our limited fresh water rivers, lakes and atmosphere.  They know humans are the primary contributor to these and don't wish to add more contributing consumption units.

Bottom line: Millennials are leery of having kids because of the attendant expense. But this is directly a function of the paucity of high paying jobs needed to: a) purchase a house, and b) raise the kid(s).  That in turn is a function of population pressures in whichever locale the person (Millennial or other) chooses to live. Reduce the population pressure and you reduce the competition for high paying jobs which in turn will lead to more youngsters (graduates)  able to get them. That in turn will lead to a better chance to have kids  - at least afford one - and also afford rent or home ownership. In any case no one ought to be having more than one kid, the Earth simply can't afford it. Meaning those of us who share the Earth can't afford to have another intense resource consumer (and polluter)  added to the mix.


Monday, March 4, 2019

"Empty Planet"? Nope - One with Far Too Many Humans - Beyond Carrying Capacity











Once again, we have the Neoliberal  and reactionary financial media trying to gloss over the population crisis.  The latest manifestation arrived in the guise of a  WSJ book review by one Lyman Stone )'A Drop In Numbers') in terms of reviewing a book 'Empty Planet' - by Darrell Bricker and John Ibbitson. (Both from the American Enterprise Institute).

Stone writes:


“Their book is a vital warning to the world that the risks associated with population have been catastrophically misread: Governments and activists have spent decades fighting the specter of overpopulation but now face the looming demographic calamity of global population collapse.”

Adding:

Fewer people participating in the economy will mean slower economic growth, less entrepreneurship, rising inequality and calamitous government debt.


To which I say ‘Hogwash!’  Because the solution of more people born to support those already alive is merely a Ponzi scheme.  Since the libertarians in this country get their panties in snits  over "Ponzi schemes" they ought to pay especial attention to this one. Because if 50 million additional workers are needed to support the existing 45 (retired) million people, how many more will be needed to support those 50 million and the tail end of the earlier 45 million? Can't these imbeciles see that the base of population support is a never-ending growth proposition? 


There are more than sufficient unemployed or underemployed people in the developed world to make up for the deficits anywhere.  At last reporting the OECD estimated 230 m in Europe alone.  Even the authors at least conceded there is merit to allowing foreign workers in to fill the bill but with "selective standards. As Steon puts it (ibid.):

"Of course there are plenty of immigrants today to prop up growth and the authors sensibly suggest the U.S. should adopt a Canadian -style, merit based system Buyt then they worry that by giving in to anti-immigrant, nativist sentiments the UNitied States will "throw away the very tool that hs been the secret to its greatness."

Well, those libertarian authors do have a point and more  to support their arguments than the reviewer, Stone, i.e. "if we admit more immigrants our demographic bubble bursting will only be postponed."

Not really!  Africa, for example, is on a tear to sport the world's largest population increase by 2050 - nearly 2.5 billion. Surely many millions of African immigrants can help with our demographic issues (and less population of whities). That is, if we can ever rid ourselves of Trump's dismissive  epithet of "shithole countries".

Indeed, in yesterday's WSJ there was a further wake up call piece ('Employers Push For More Seasonal Visas', p. A6)  on why we desperately need more lower wage immigrants, especially to do the jobs Americans refuse to do - from carcass butchering at meat plants, to landscaping, to farming to fish and crab cleaning in Maryland.  


The article noted that employers who rely on seasonal (temporary) H-2B visas are renewing their fight to lift limits.  The situation with too few needed workers became so desperate that the Labor Dept. website crashed "after a scramble by employers chasing 33,000 available permits."  This is absolute nonsense.

The piece added:

"The Jan. 1 meltdown stemmed from high demand and a move to make the process first come, first served."

We also learned:

"Industries ranging from tourism to agriculture to landscaping to amusements say they are reliant on foreign workers and the H-2B program"

Note that congress can allow up to 69,000 such permits if the administration agrees, but up to now the Trumpie dolts - lead by Nazi wannabe Stephen Miller - have not. Hell, these nincompoops are even trying to cut back on the H-1B visas for more professionally qualified workers.

My point here is that all the hand wringing about too few people to support growth and we need more babies is plain hogwash. 

Stone also babbles, re: why the population is supposedly crashing:

"The authors pin the blame on faulty assumptions by the population establishment as represented by the UN Population Division. They don’t use the U.S. as an example but I will. The UN’s most recent population forecasts suggest the average U.S.  total fertility rate from 2015 to 2020 shold be 1.9 children per woman. In reality, CDC data shows U.S. fertility has averaged about 1.8 children per woman from 2015-2018,”

Not taking into account the Earth overshoot phenomenon, e.g. as illustrated below:


At root, the issue is sustainability - especially for water which is needed for crops. NO water, no crops to feed a growing population. The interpretation of the graph (upward) is simple. By June, 2030 TWO full Earths - that is the resources therein - will be needed to support the then population. Already we are at 1.5 Earths. Every year Global Footprint Network raises awareness about global ecological overshoot with its Earth Overshoot Day campaign. Earth Overshoot Day is the day on the calendar when humanity has used up the resources that it takes the planet the full year to regenerate

Even Terry Spahr, Executive Director of Earth Overshoot, was compelled to send a letter to the WSJ to contradict the Stone review and many of the claims made by the book's authors. Spahr emphasized the clear benefits of a less populated world, including: "Fewer workers will command higher wages, the environment will improve,  the risk of famine will wane and falling birthrates in the developing world will bring greater affluence."   

A huge additional benefit is there will be fewer abortions in the developed world (cf. 'Fewer Births, Fewer Abortions', WSJ, Feb. 23-24, by Jo Craven McGinty).  As the author observed, "At 1.8 total fertility the number of children women are expected to have in their lifetime is near the 1976 low of 1.7."  "And "for the first time since 1975 the number of abortions in the U.S. dropped."  

The basis here is not mystifying and doesn't require one pass a Mensa admissions test.  Essentially, when women can choose the size of their families (for economic and other reasons) then they will be less likely to hit the abortion switch in the case of children not wanted.   The point is there are multifold benefits to keep our numbers lower.



Further, it is preposterous for those like the AEI authors to chirp about Americans needing to increase baby production when there is no incentive from the gov't to do so.  I refer to those like an ER nurse featured in a spot this a.m. on CBS Early Show. She took her allotted 12 unpaid weeks to care for her newborn, then found her family on the ropes financially.  By the end she was deep in debt and had to cash out a portion of her 401(k) to make ends meet.  Even then, she was left with barely $500 in the bank to pay her bills.

That contrasts with another new mom (Marquita Staples-Green)  - also presented in the segment- who was able to get 26 weeks of fully paid leave- compliments of her company, software firm Adobe. As she put it:

"By the time I went back to work, I was ready, I was prepared. I had some time off, I could think about my new goals as a working mom.  I am completely grateful but I just wish this was the norm."

Well, sadly it isn't the norm, given only 16 percent of American new moms are the enviable position of Ms. Staples- Green, i.e. having access to paid leave via their employers. That is not even 1 in 6 women!  It also explains, as presenter Alex Wagner noted, why so many women in this country need to secure infant care within weeks of giving birth.

So why should these Neolib knuckleheads, ensconced in capitalist outposts like the AEI,  incessantly express surprise that fewer American women are having kids in this "lotto" environment? (And we won't even get into how much it takes to even raise 1 kid to high school graduation level now, far less through university.)

To be sure, the Democrats' "Family and Medical Insurance Leave Act"  would give workers twelve weeks of partially paid leave funded by a payroll tax.  That is, workers would be able to draw on their Social Security early to get the needed leave.  I don't believe I need to explain why this is dead in the water, given the basis is  almost as bad as the ER nurse taking out part of her 401(k).  In other words, if enacted (which odds I place at slim to none) it would just add to the nation's retirement crisis. 

In  many respects this latest AEI- based effort reminded me of the book, 'The Birth Dearth' by Ben Wattenberg. He was also then a fellow at the conservative American Enterprise Institute. This association no doubt accounts for the thesis expounded in his book that the "Western industrialized nations are flirting with economic disaster and marginalization by maintaining too low birth rates."

 By Wattenberg's analysis from over 30 years back, the resulting missing babies would be translated into "missing producers and consumer, soldiers and sailors, mothers and fathers".


Again, nonsense not too different from the latest AEI iteration.  Then as now, in terms of the impact on non-renewable resources, each child in a Western-developed nation consumes a disproportionate share of limited resources.   The U.S. offers the worst example: 6% of the world's population gobbling up some 25- 30% of the available resources in a given year. What Wattenberg and now Ibbitson & Bricker are proposing (and largely for purely economic gains) is nothing short of lunacy in this light.


A far more rational take is afforded by Herman Daly, University of Maryland Professor of Ecological Economics, in his book 'Steady State Economics'. The problem is the concept of "growth" is bogus on its face. Only a congenital moron would continue to pander to unchecked growth (and the increased population that feeds it) in a finite, zero-sum environment or planet. Especially one in which artificial wealth is created by extracting resources  that necessarily diminshes and degrades the remaining resource base. By "artificial wealth" I mean materials or converted resources (other than food) that cannot sustain your life. They may window-dress it, like the latest X-box game, but they won't sustain it.

Another sane alternative is offered by Aurelio Peccei's `One Hundred Pages for the Future' . Peccei makes a passionate plea for humans to notch their numbers down to replacement levels or lower since they've exceeded the Earth's ability to support them. (Part 1: `The Ascent and Decline of Humankind'). Peccei refers to an enormous supplemental population - one that exists beyond the ability of additional resources to support humans, hence  existing as a "human bomb threatening the planet".

Meanwhile, the late, noted science writer and biochemist Isaac Asimov- in various essays written over decades- has also warned of similar constraints on humanity's use of resources, particularly in terms of how population growth impinges on finite resources and sets limits to growth. Asimov was probably also the first to use the term "carrying capacity" * which he estimated to be 3 billion humans for this limited world.

By contrast, Wattenberg's book essentially tosses the very concept of carrying capacity out the window.

More recently, in an article appearing in `Physics Today' (July, 2004 issue): `Thoughts on Long-Term Energy Supplies: Scientists and the Silent Lie', Albert Bartlett pinpointed the failure to name human population growth as a major cause of our energy and resource problems.

Bartlett avers that "their (scientists') general reticence stems from the fact that it is politically incorrect or unpopular to argue for stabilization of population - at least in the U.S. Or perhaps scientists are uncomfortable stepping outside their specialized areas of expertise".


But Bartlett himself, in books and lectures, i.e.


https://www.youtube.com/watch?v=kZA9Hnp3aV4

 Has perhaps given the best reason for this reticence of scientists to speak out: the realization that too few Americans understand the concept of exponential increase which lies at the heart of population increase.


But if Americans' math issues and  physicists (and other scientists')silence share blame, the corporate media also shares as much or more for having the facts and refusing to level with the public. For example, on the issue of overshoot of our finite resources. 
 


Indeed, I doubt any major newspaper (or corporate media website)  has published any relevant data on it since it became available. Why not? Because it would cut through all the propaganda, PR and 'feel good' economic bunkum (e.g. about needing more people to increase global GDP) to show we are unambiguously in a crisis with regard to resource sustainability.
 

 There is also no mention that every energy conversion pollutes and degrades the environment we depend upon.  Multiply those conversions - say via more and more people- and we quickly descend into a higher entropic, higher waste world.  

Are we there yet? Actually, we're way beyond it. As pointed out by Christopher Mims (WSJ, Exhange, Mar.2-3, p. B10):

"In 1950, the world produced about 4 billion pounds of plastic per year.  Today, we produce 600 billion pounds. Every year 20 billion pounds of it ends up in the ocean.  Over 90 percent of produced plastic has never been recycled, and it typically takes more than 400 years to break down naturally."

Think there's gotta be a techno fix? Dream on!  As Mims goes on to note, after citing the Chinese refusal to process any more foreign waste:

"It's a crisis so big that no amount of technology, innovation or policy can solve it in the near future ..."

In other words, we are converting the planet's oceans into massive crypts that will likely sustain no living things - maybe not even jellyfish - in another 100 years.

Sadly, too many of our citizens fail to appreciate that every energy conversion process features an accompanying entropy or increased disorder.  Thus, the combustion of fuel in an internal combustion engine releases carbon monoxide as well as CO2 and other pollutants. Further, the 2nd law of thermodynamics states that the expelled constituents can never be used again for positive energy.   


Turning resources into waste faster than even a fraction of waste can be recovered-recycled thereby sets the stage for global ecological overshoot which depletes the very resources on which human life and the natural environment depends.

The astute and aware citizen must be sentient enough to know more people is not in humanity's best interest. Isaac Asimov, as part of his February, 1976 Barbados lecture e.g.

warned that humans had two choices: decrease their population to the carrying capacity limit to live in an equilibrium with the Earth and its resources, or let nature “increase the human death rate” (e.g. by starvation, pestilence, wars over resources etc.)

He also remarked:

"It is now the willingly childless woman who is the heroine of our planet. She is the one who now deserves all the kudos and praise, for helping to do what is necessary to spare humanity from the ravages of over-population"


Empty planet? No. A perilously overpopulated one, and more than twice in excess of its carrying capacity. 

See also:

https://www.ft.com/content/c0a77b28-3c2c-11e9-b856-5404d3811663
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*  Carrying capacity = (usable land-water resource base providing water + food + fuel) / (individual food, fuel + water requirement)


Now, if the numerator is  11.4 x 10 9   hectares of usable aggregate equivalent land-water resource base and if 6 hectares is the ideal mean individual requirement over a lifetime (e.g. meet all basic needs and have a few private luxuries) , that means:

 CC = (11.4 x 10  9 hectares) / 6 hectares/person   =  2 billion.

Obviously, this can be increased if the numerator can be increased or the denominator (each individual's ecological footprint) decreased.

Wednesday, January 9, 2019

Selected Questions - Answers From All Experts Astronomy Forum (Origin of Planetary Nebula)

Question:  I am interested in knowing about the origin of the planetary nebula, such as the Ring nebula in the constellation Lyra. Basically, how did the term originate and also what is the physical natures of these nebulas?  - Amateur astronomer, Dallas TX


Answer:  The Ring Nebula you referenced is shown in the accompany image from Mt. Palomar Observatory.  But, of course even in a good telescope you will not see it like that but rather more like the image shown below, taken with my Schmidt -Cassegrain Celestron scope in August,  1980..
Image may contain: night

The reason for the radical difference  is that no color enhancement has been applied to the second image.  Apart from some extra magnification it "is what it is".   This is pretty well how it appears in the telescope eyepiece, except much dimmer and fuzzier!

As to the origin of the name "planetary" this can be traced to the early observers being misled by the condensed, roundish appearance by surmising the objects were planetary like hence planetary nebula.   But when observed in a small telescope this is easily dispelled. After all,  what planet- like object has a hole in its center?  It was only after the invention of the spectroscope that the real nature of the object was established.

It was found in particular that the atoms of the ring  -like gas cloud (such as for the object shown) emitted a great deal of radiant energy.  This was compatible with temperatures in the thousands of degrees Celsius.  Again, this would confirm the objects were in no way "planet like".  The detection of the direction of expansion of the gaseous material also substantiated this.

What exactly is a planetary nebula and how does it come about? We are still not 100 % certain of the physical details but there is mounting evidence these objects are associated with the later stages of a star's life, especially  for moderate to relatively low mass stars like the Sun. Basically, it is found that the central star typically belongs to the white dwarf class. A star which has already had its heyday as far as nuclear fuel consumption in its core is concerned.

The best way to think of a white dwarf is as the partially collapsed core of such a star, e.g. like the Sun. Most plausibly, the white dwarf stage is triggered after a star like Sun becomes a Red Giant.  This would coincide with the time  when all the nuclear fuel (H, He)  is exhausted.  In the explosive instability process itself, two things happen:   1) The ejected gaseous surface- the ring if you will -   becomes the expanding shell of gas around the remnant core, and 2) the remnant itself collapses since with the outer, radiative layers blown away the star can no longer support itself against gravity.  

Note here that the time between when the star ceases to fuse Helium and the ejection of its outer gas layers -i.e.  to become a planetary nebula- is inconceivably long,  on the order of 8 billion years. 

The outer expanding gas shell is what we are actually calling the planetary nebula. The central  remnant core meanwhile can attain temperatures up to 100,000 K.   As the last of the fuel is exhausted the hot core  becomes a white dwarf.  In his excellent book, 'The Collapsing Universe', Isaac Asimov describes in detail the collapse process peculiar to the white dwarf phase and might be worth a read.  From his parameters he estimates that just one teaspoonful of such an object could tilt the scales at 15 tons.

Ultimately - as Asimov and many others have pointed out- the white dwarf's further contraction (from which it extracts its energy) is prevented by degenerate gas pressure. The white dwarf can now only radiate what limited stored energy it has left.   How long would it take to radiate all the remaining stored energy away and then become a black dwarf?  We can't say for sure, but some,   like Asimov, believe it could be up to several trillion years, maybe more.

Parsing the origin of the white dwarf definitely gives one a cosmic perspective.