While fuel cell or electric vehicles emit no carbon dioxide themselves, CO2 is produced when hydrogen or electricity is produced from fossil fuels.

虽然燃料电池和电动汽车本身不会释放二氧化碳，但使用化石燃料生产氢气或电能依旧会产生二氧化碳。

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"The same taste cell has all the machinery to turn carbon dioxide into protons and then detect the protons as sour taste stimuli," said Alexander Bachmanov, who was not involved in the study.

这项研究的研究者亚历山大·巴奇马诺夫说：“相同的味觉细胞都拥有这些机能：将二氧化碳转化为质子，当酸感刺激的时候能感应这些质子。”

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In it, electrodes generate chemical reactions that cleanse the bowl and turn organic waste into carbon dioxide and hydrogen that can be stored in a fuel cell for use at night.

在系统里，电极产生化学反应，清洁厕盆并将有机废物转化成二氧化碳和氢，储存在燃料电池里，供马桶夜间使用。

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The project aims to establish cell-phone based carbon micro-credit systems, using a simple message service to allow families to monetize the carbon offsets they produce.

WSJ: Unlocking Africa's Energy Potential

Current techniques aren't exactly cheap, but researchers from Stanford University think they've made a bit of a breakthrough by producing a relatively inexpensive photovoltaic cell using nothing but carbon.

ENGADGET: Stanford researchers create 'world's first' all-carbon solar cell, do it on the cheap

Siemens and Shell, for example, have just announced a new fuel-cell technology for oil rigs that will capture emissions of carbon dioxide and methane, generate power from them cleanly, and sequester the exhaust.

ECONOMIST: Emissions