(1) K-12 schools account for 7.7% of primary energy use in commercial buildings, that is 536 trillion btu out of 6,963 trillion btu (EIA source CBECS). 2015 commercial building sector CO2 emissions were 932 million metric tons (MMT) CO2 (EIA), so K-12 was responsible for 72 MMT CO2. Note that this calculation uses two assumptions: 1) that K-12 schools have similar geographic distribution to all commercial buildings; 2) that K-12 schools proportion of energy use among fuels (electricity, natural gas, oil) is roughly similar to average of commercial buildings (checked using CBECS microdata which looks at number of buildings in the CBECS sample that use the various fuels). Emissions equivalencies calculated using EPA greenhouse gas equivalencies calculator. 15.4 million cars represent 14% of 113 million automobiles registered in the U.S. in 2016 (Statista)
(2) U.S. Environmental Protection Agency. (2011). Energy Efficiency Programs in K-12 Schools: A Guide to Developing and Implementing Greenhouse Gas Reduction Programs. U.S. Environmental Protection Agency State and Local Climate and Energy Program. Retrieved December 20, 2017, from https://www.epa.gov/sites/production/files/2017-06/documents/k-12_guide.pdf
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