Drivers of the US CO2 emissions 1997-2013.

Drivers of the US CO2 emissions 1997-2013.
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DOI:
10.1038/ncomms8714
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发表时间:
2015-07-21
影响因子:
16.6
通讯作者:
Hubacek K
Hubacek K
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Feng K;Davis SJ;Sun L;Hubacek K

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2007年至2013年间,美国的化石燃料二氧化碳排放量减少了约11%,从6023亿吨减少到5377亿吨。这种下降被广泛归因于美国电力生产从使用煤炭转向使用天然气。然而,导致下降的因素尚未得到定量评估;因此,天然气在这一下降中的作用仍然是猜测性的。在这里,我们分析了1997年至2013年影响美国排放的因素。2007年以前,排放量的增加主要是由经济增长驱动的。2007年以后,排放量的减少主要是经济衰退的结果,燃料结构的变化(例如,以天然气替代煤炭)起了相对较小的作用。因此,随着美国经济的复苏和增长,能源-气候政策可能是必要的,以锁定最近的减排,并推动能源系统进一步脱碳。2007年至2013年间,美国的二氧化碳排放量下降了约11%;这一趋势被广泛归因于天然气使用量超过煤炭使用量的增加,但这种下降背后的驱动因素仍未量化。在这里,作者分析了驱动因素,并表明最近的经济衰退是排放量下降的主要原因。
Fossil fuel CO2 emissions in the United States decreased by ∼11% between 2007 and 2013, from 6,023 to 5,377 Mt. This decline has been widely attributed to a shift from the use of coal to natural gas in US electricity production. However, the factors driving the decline have not been quantitatively evaluated; the role of natural gas in the decline therefore remains speculative. Here we analyse the factors affecting US emissions from 1997 to 2013. Before 2007, rising emissions were primarily driven by economic growth. After 2007, decreasing emissions were largely a result of economic recession with changes in fuel mix (for example, substitution of natural gas for coal) playing a comparatively minor role. Energy–climate policies may, therefore, be necessary to lock-in the recent emissions reductions and drive further decarbonization of the energy system as the US economy recovers and grows. US CO2 emissions dropped ∼11% between 2007 and 2013; a trend widely attributed to the increased use of natural gas over coal, yet the drivers behind this decline remain unquantified. Here, the authors analyse the drivers and show that the recent economic downturn is primarily responsible for the emissions drop.