Found this today

http://blog.oregonlive.com/environment_impact/2009/07/carbon%20legacy.pdf

Pretty dense article, science wise, but 

LOOK AT TABLE 3, PAGE 18 TO SEE WHAT CHILDREN DO TO THE CARBON EQUATION.

Found that link in this article, that discusses having fewer children.

http://www.npr.org/2016/08/18/479349760/should-we-be-having-kids-in-the-age-of-climate-change

Some good thoughts there.  Better than usual anyway.