According to this site about 2-3% of the global emissions. http://www.yaleclimateconnections.org/2015/09/evolving-climate-math-of-flying-vs-driving/ http://www.

According to this site about 2-3% of the global emissions. http://www.yaleclimateconnections.org/2015/09/evolving-climate-math-of-flying-vs-driving/ http://www.yaleclimateconnections.org/2015/09/evolving-clima... Seems like something other than flying might be a better target to reduce carbon emissions.