Some subscribers to Math-Teach might be interested in a recent post "National Geographic - 8 Part Special Series: 7 Billion" [Hake (2013)].

Q. What does overpopulation have to do with Math-Teach ?

A. Please see the Bartlett signature quotes.

The titles are (in order of publication):

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"Population 7 Billion: How your world will change" <http://bit.ly/UcyQBl>;
"Enter the Anthropocene Age of Man" <http://bit.ly/134FbE6>;
"The Acid Sea" <http://bit.ly/Unp40r>;
"The Coming Storm: The people of Bangladesh have much to teach us about how a crowded planet can best adapt to rising sea levels. For them the future is now" <http://bit.ly/12Z2oZl>;
"Food Arc" <http://bit.ly/134HcjQ>;
"Machisma: How a mix of female empowerment and steamy soap operas helped bring down Brazil's fertility rate and stoke its vibrant economy" <http://bit.ly/VvjzMu>;
"Rift in Paradise: Africa's Albertine Rift" <http://bit.ly/ZcVjUQ>;
"The City Solution" <http://bit.ly/S5wUPh>.
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To access the complete 5 kB post please click on <http://bit.ly/Xk2yKl>.

Richard Hake, Emeritus Professor of Physics, Indiana University
Links to Articles: <http://bit.ly/a6M5y0>
Links to Socratic Dialogue Inducing (SDI) Labs: <http://bit.ly/9nGd3M>
Academia: <http://bit.ly/a8ixxm>
Blog: <http://bit.ly/9yGsXh>
GooglePlus: <http://bit.ly/KwZ6mE>
Twitter: <http://bit.ly/juvd52>

The greatest shortcoming of the human race is our inability to understand the exponential function."
 - A.A. Bartlett (2004)

"In our classrooms and in our lives as scientists, we must acknowledge that overpopulation is the world's most serious and threatening problem and that this problem requires immediate and urgent attention."
   -A.A. Bartlett (2012)

REFERENCES [URL's shortened by http://bit.ly/ and accessed on 02 Jan 2013.
]
Bartlett, A.A. 2004. "The Essential Exponential! For the Future of Our Planet," Center for Science, Mathematics & Computer Education, University of Nebraska, Lincoln, publisher's information at <http://bit.ly/VpN2pm>.  Author's information at <http://bit.ly/VJQzRN>. The first chapter is online at  <http://bit.ly/QKtjEh>.

Bartlett, A.A. 2012. "The Meaning of Sustainability," Teachers Clearinghouse for Science and Society Education Newsletter 31(1); online at <http://bit.ly/SyM0t8>.

Hake, R.R. 2012. "L.A. Times Population Report: Beyond 7 Billion," online on the OPEN! AERA-L archives at <http://bit.ly/Ufro6y>. Post of 5 Dec 2012 14:23:20-0800 to AERA-L and Net-Gold. The abstract and link to the complete post are being transmitted to several discussion lists and are also on my blog "Hake'sEdStuff" at <http://bit.ly/YBNFUU> with a provision for comments.
Hake, R.R. 2013. "National Geographic - 8 Part Special Series: 7 Billion," online on the OPEN! AERA-L archives at <http://bit.ly/Xk2yKl>. Post of 2 Jan 2013 15:45:29 -0800 to AERA-L and Net-Gold. The abstract and link to the complete post are being transmitted to several discussion lists and are also on my blog "Hake'sEdStuff" at <http://bit.ly/RtO5Zf> with a provision for comments.  See also the earlier "L.A. Times Population Report: Beyond 7 Billion" [Hake (2012)].