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US CO2 emissions fall

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Hydrocarbon Engineering,

US energy-related carbon dioxide (CO2) emissions in 2016 totalled 5170 million t, 1.7% below their 2015 levels, after dropping 2.7% between 2014 and 2015. These recent decreases are consistent with a decade-long trend, with energy-related CO2 emissions 14% below the 2005 level in 2016.

As noted in a recent article on energy use, both oil and natural gas consumption were higher in 2016 than in 2015, while coal consumption was significantly lower. Consistent with changes in fuel consumption, energy-related CO2 emissions in 2016 from petroleum and natural gas increased 1.1% and 0.9%, respectively, while coal-related emissions decreased 8.6%.

There are several ways to assess CO2 emissions trends within the context of measures of economic activity. Carbon intensity is a measure that relates CO2 emissions to economic output. Early estimates indicate that gross domestic product (GDP) grew at a rate of 1.6% in 2016, down from 2.6% in 2015. Taken together with a 1.7% decline in energy-related CO2, the 1.6% estimate of economic growth implies a 3.3% decline in the carbon intensity of the US economy. In 2015, carbon intensity of the economy had decreased by 5.3%.

The US transportation sector was the only consumption sector where CO2 emissions increased in 2016. CO2 emissions from the transportation sector increased by 1.9%, largely reflecting emissions from motor gasoline, which increased 1.8% in 2016. Emissions from the transportation sector surpassed those from the power sector during 2016 — a trend that persists through at least 2040 in the reference case projections in EIA’s 2017 Annual Energy Outlook.

CO2 emissions from the electric power sector fell by 4.9% in 2016. A significant reduction in coal use for electricity generation was offset by increased generation from natural gas and renewable sources. Renewables do not emit CO22

Weather also affected the level of energy use and CO2

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