Re: [Phys-l] H. Sapiens

["Rauber, Joel" <Joel.Rauber@SDSTATE.EDU>]

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
Brookings, SD 57007
Joel.Rauber@sdstate.edu 
605.688.5428 (w)
605.688.5878 (fax) 


> -----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% per
> time y, the
> > doubling time is roughly 70/x to double in y units. That is, a
> percentage growth
> > rate of (say) 1% leads to a doubling of population in about 70 years.
> That's
> > _scary_ to me, for _any_ population.
> >
> >
> >
> >
> >  /**************************************
> > "The four points of the compass be logic, knowledge, wisdom and the
> unknown.
> > Some do bow in that final direction. Others advance upon it. To bow
> before the
> > one is to lose sight of the three. I may submit to the unknown, but
> never to the
> > unknowable." ~~Roger Zelazny, in "Lord of Light"
> > ***************************************/
> >
> >
> >
> >
> > ________________________________
> > 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
> problem:
> > "Throughout most of the twentieth century Mexico's population was
> characterized
> > by rapid growth. Even though this tendency has been reverted and
> average annual
> > population growth over the last five years was less than 1%, the
> demographic
> > transition is still in progress, and Mexico still has a large cohort
> of youths."
> > 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
> at:
> > > 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
> probably double
> > > > again in less than 20 years. How can one be optimistic about the
> future of
> > > > sapients?
> > > >
> > > >
> > > > Ludwik
> > > >
> > > > http://csam.montclair.edu/~kowalski/life/intro.html
> > > >
> > > >
> > > >
> > > >
> > > > _______________________________________________
> > > > Forum for Physics Educators
> > > > Phys-l@carnot.physics.buffalo.edu
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> > >
> > > Ludwik
> > >
> > > http://csam.montclair.edu/~kowalski/life/intro.html
> > >
> > >
> > >
> > >
> > > _______________________________________________
> > > Forum for Physics Educators
> > > Phys-l@carnot.physics.buffalo.edu
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> >
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> >
> >
> >
> >
> > _______________________________________________
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>
>
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