Watch the Global Hawk Hunt For Water Vapor In the Name of Science

Very little water vapor ever rises above the troposphere (where the majority of Earth's weather occurs) but the little bit of vapor that makes it to the stratosphere is kind of a big deal. One recent study suggests that just a one to two percent increase in mid-stratospheric humidity can retain up to twice as much… » 1/24/13 12:00pm 1/24/13 12:00pm