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Explaining and understanding declines in U.S. CO2 emissions / Zeke Hausfather. Berkeley Earth, Aug. 2013, 28 p.http://static.berkeleyearth.org/memos/explaining-declines-in-us-carbon.pdfSeven  key  factors,  combined  with  the  impacts  of  a  prolonged  economic  slowdown,  have   led  U.S.  CO2  emissions  to  fall  to  1996  levels,  approaching  even  the  long-­‐abandoned   Kyoto  Protocol  target.  Is  it  conceivable  that  U.S.  CO2  emissions  may  actually  have   peaked?...