By Andrew P. Napolitano
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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, and government officials say the biggest reason is that cheap and plentiful natural gas has led many power plant operators to switch from dirtier-burning coal.

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, and government officials say the biggest reason is that cheap and plentiful natural gas has led many power-plant operators to switch from dirtier-burning coal.
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, and government officials say the biggest reason is that cheap and plentiful natural gas has led many power plant operators to switch from dirtier-burning coal.

Perhaps no climate science icon is more recognizable than the "hockey stick" graph originally produced by Michael E. Mann and his colleagues in the 1990s and first published in the prestigious journal Nature in 1998. This icon quickly became the feature diagram in the 2001 Intergovernmental Panel on Climate Change Third Assessment Report summary document for policymakers.