In this June 25 photo, a crew works on a drilling rig at a well site for shale based natural gas in Zelienople, Pa. In a surprising turnaround, the amount of carbon dioxide being released into the atmosphere in the U.S. has fallen dramatically to its lowest level in 20 years in large part due to an industry switch from burning coal for electricity to burning natural gas.
Read the article: CO2 emissions in US drop to 20-year low
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