CO2 is the most important of the greenhouse gasses that we have in our atmosphere.From 2000 to 2012, emissions of CO2 have been _______ in the U.S.and __________ globally.

Question

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In the U.S., CO2 emissions decreased due to factors like improved energy efficiency and a shift from coal to natural gas. Globally, emissions increased due to industrial growth in countries like China and India.

CO2 Is the Most Important of the Greenhouse Gasses That