CO2

In August 2008, the Center for Immigration Studies promoted Kolankiewicz’s research, publishing a joint study arguing that “immigration to the United States significantly increases world-wide CO2 emissions.”

“Future drought is mainly determined by how warm it gets, and how much CO2 we emit. So first and foremost is to control the CO2 emissions.”

Additionally, the increase in CO2 allows more vapor to form in the air.

These computer models stripped out the effects of the billions of tonnes of CO2 that humans have pumped into the atmosphere.

But the WMO's scientists also says they have seen some evidence that as the world gets warmer, trees are not able to soak up the same level of CO2 as they once were.