By 2020 California will require all the petrol sold there to meet a low-carbon standard.

到2020年加利福尼亚将要求所有出售的汽油达到低碳含量标准。

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And California has adopted a low-carbon fuel standard that will require oil companies to cut the carbon content of their petrol.

而且加州已经通过了低碳燃料标准，要求石油公司降低他们汽油中的含碳量。

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Using a combination of petrol and electricity, hybrids can be recharged using standard electric outlets.

由汽油和电力组合的混合动力汽可以使用普通电源插座充电。

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Thus the electric car is harvesting in terms of well-to-wheel miles only about 27% of the original fossil fuel energy, so not that much better than the standard car running on petrol or diesel.

FORBES: The Heretic: Electric Cars Should Be Called Coal Cars

Makers of fixed-wing aircraft are also looking at diesel engines, in small planes at least, where they show promise as a serious alternative to standard piston engines, which run on a high-octane form of petrol.

ECONOMIST: Monitor