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I imagine that it is clear that that growth is unsustainable. The real question is how does it go down? There are nicer and less nice ways that that could happen; and it will affect us (if your young enough) our children and our grandchildren.
_________________________
Joel Rauber, Ph.D
Professor and Head of Physics
Department of Physics
South Dakota State University
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Joel.Rauber@sdstate.edu
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-----Original Message-----
From: phys-l-bounces@carnot.physics.buffalo.edu [mailto:phys-l-
bounces@carnot.physics.buffalo.edu] On Behalf Of marx@phy.ilstu.edu
Sent: Thursday, September 16, 2010 12:33 PM
To: Forum for Physics Educators
Subject: Re: [Phys-l] H. Sapiens
The current growth rate for the human population of the entire planet is
1.17 %/yr, leading to a doubling
in about 60 years. However, experts believe that this rate of growth is
unsustainable that that the
actual doubling time will be much longer, if it ever happens. There are
the questions of adequate
resources, disease, military actions, and natural disasters, which can
all greatly affect the growth rate.
On 16 Sep 2010 at 10:22, curtis osterhoudt wrote:
Remember the simple rule-of-thumb: If something is growing at x% pertime y, the
doubling time is roughly 70/x to double in y units. That is, apercentage growth
rate of (say) 1% leads to a doubling of population in about 70 years.That's
_scary_ to me, for _any_ population.unknown.
/**************************************
"The four points of the compass be logic, knowledge, wisdom and the
Some do bow in that final direction. Others advance upon it. To bowbefore the
one is to lose sight of the three. I may submit to the unknown, butnever to the
unknowable." ~~Roger Zelazny, in "Lord of Light"problem:
***************************************/
________________________________
From: Bernard Cleyet <bernardcleyet@redshift.com>
To: Forum for Physics Educators <phys-l@carnot.physics.buffalo.edu>
Sent: Thu, September 16, 2010 11:15:34 AM
Subject: Re: [Phys-l] H. Sapiens
Contrary to what I presume many think, Mexico is less adding to that
characterized
"Throughout most of the twentieth century Mexico's population was
by rapid growth. Even though this tendency has been reverted andaverage annual
population growth over the last five years was less than 1%, thedemographic
transition is still in progress, and Mexico still has a large cohortof youths."
at:
http://en.wikipedia.org/wiki/Demographics_of_Mexico
bc
Demographic transition:
http://anthrocivitas.net/forum/showthread.php?t=1539
On 2010, Sep 11, , at 20:15, ludwik kowalski wrote:
Actually, I was wrong about the "less than 20 years, as you can see
probably double
http://en.wikipedia.org/wiki/World_population
Ludwik
= = = = = = = = = = = = = = = = = = = = = = = = = = =
On Sep 11, 2010, at 11:05 PM, ludwik kowalski wrote:
On Sep 11, 2010, at 10:49 PM, brian whatcott wrote:
There are less than 8 billion people presently on Earth. . . .
This is about four times more than when I was a kid. It will
future ofagain in less than 20 years. How can one be optimistic about the
sapients?
Ludwik
http://csam.montclair.edu/~kowalski/life/intro.html
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Ludwik
http://csam.montclair.edu/~kowalski/life/intro.html
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