This could be dismissed as anti-human - but the theory the environment can be saved by encouraging the use of birth control is one that has been popular with media some environmentalists. 

CNN's Lou Dobbs certainly hasn't shied away from the idea. On his Sept. 21 broadcast, Dobbs revisited an early report that the true path to environmental salvation wasn't by curbing greenhouse gas, but instead by subscribing to a Malthusian theory that slowing the growth of human population was the best path.

"We have more tonight on a story that we first brought to you last month, Dobbs said. "There is new evidence of the negative impact of overpopulation on our environment. The biggest threat to the environment isn't, it turns out, gas-guzzling cars or power plants but rather having too many children all around the world."