Re: [Phys-l] H. Sapiens

[curtis osterhoudt <flutzpah@yahoo.com>]

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. 




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________________________________
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
> > https://carnot.physics.buffalo.edu/mailman/listinfo/phys-l
>
> Ludwik
>
> http://csam.montclair.edu/~kowalski/life/intro.html
>
>
>
>
> _______________________________________________
> Forum for Physics Educators
> Phys-l@carnot.physics.buffalo.edu
> https://carnot.physics.buffalo.edu/mailman/listinfo/phys-l

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