This means that carbon which comes from a plant, or a swamp-dwelling bacterium that is digesting that plant, will have less 13C in it than did the carbon in the atmosphere from which the plant drew its sustenance.

ECONOMIST: Methane and climate change

Electric cars help fight global warming because they contribute less greenhouse gases to the atmosphere than gasoline-powered cars, even if the electricity is made in a coal-fired power plant.

NPR: Entrepreneur Hopes To Charge Electric-Car Market