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Politics : Formerly About Advanced Micro Devices
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To: Wharf Rat who wrote (900035)12/7/2015 1:52:44 PM
From: TimF  Read Replies (1) of 1575119
 
What is striking in the EPA's 2011 U.S. Greenhouse Gas Inventory, beyond the particular question of green completions and best practices, is how low its estimate of methane leakage is, relatively to total U.S. emissions. On p. ES-13 of the Executive Summary, EPA reports that CH4 accounts for 8.8 percent of total U.S. greenhouse gas emissions. With leakage from natural gas systems accounting for less than a quarter of total CH4 emissions, methane leakage appears to represent only about 2 percent of total U.S. greenhouse gas emissions, if the EPA is right. On the face of it, the benefits from switching large fractions of coal generation to gas—producing a 50 percent cut in greenhouse gas emissions, per unit energy—would seem to far outweigh the emissions costs from leakage.

Of course the methodology EPA has used in its estimates is hugely complex and, therefore, open to dispute.

spectrum.ieee.org
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