Water Vapor Rules the Greenhouse System

Monte Hieb at Geocraft.com Last revised: January 10, 2003 Just how much of the “Greenhouse Effect” is caused by human activity? It is about 0.28%, if water vapor is taken into account– about 5.53%, if not. This point is so crucial to the debate over global warming that how water vapor is or isn’tfactored into an analysis of Earth’s greenhouse gases makes the difference between describing a significant human contribution to the greenhouse effect, or a negligible one.