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For real global killers, we need only listen to the World Health Organization:

"Air pollution is a major environmental risk to health and is estimated to cause approximately 2 million premature deaths worldwide per year. ... Significant reduction of exposure to air pollution can be achieved through lowering the concentrations of several of the most common air pollutants emitted during the combustion of fossil fuels."

http://www.who.int/mediacentre/factsheets/fs313/en/index.html