Growth in Energy Efficiency, Not Shale Gas Use, Drove US Emissions Decline: Study

Demand Reduction Slashes US CO2 Emissions in 2012 / by Shakeb Afsah and Kendyl Salcito [dated May 1, 2013]
CO2 Scorecard Group
http://co2scorecard.org/home/researchitem/27

Energy related CO2 emissions in the US fell by 205 million metric tons in 2012. CO2 Scorecard breaks it down and shows that nearly 75% of the decline is accounted for by demand reduction primarily due to the economy-wide energy efficiency and conservation measures in the transportation, residential and commercial sectors; the mild winter in the first quarter of 2012 also gave a helping hand.

Contrary to popular perception, the contribution of natural gas in the electric power sector was limited to around 26% of the total energy related CO2 reduction in 2012. Analysis of the changes in the electricity generation mix for each of the eight NERC regions in the US revealed that nearly 25-30% of the CO2 savings from coal-to-natural gas switch was offset when gas replaced zero carbon sources like hydro and nuclear. This effect was most prominent in the Western interconnection (WECC). Industries along with wind and solar had little measurable role in cutting CO2 emissions in 2012.

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