Air Traffic Poised to Become a Major Factor in Global Warming, Scientists Predict

Air traffic predicted to increase 7-fold by 2100, and hence to become a significant source of greenhouse gases. Note that this is a prediction only, but it is rare for attention to be given to this source, and it was not even included in the Kyoto protocol.
Link: http://www.sciencedaily.com/releases/2010/05/100526124715.htm
Source: Science Daily / American Chemical Society