Population control. Every 30 seconds someone, usually a kid in a third world nation, dies of Malaria. The third world nations are the biggest contributors to "Green House Gases". Think of it. Some environmentalist is always trying to shove some crap down our throats about fossil fuels and the like. But the last I heard every fricken human on this planet is generating CO2(one of the GH gases) 24 hours a day. And where are most of these people? In third world countries. So if we wipe China, India, and Africa off the face of the map we will be taking a great step for mankind in our quest to reduce 'Global Warming'.
Makes sense to me.