Last time we talked about photosynthesis, the process by which plants use light to convert carbon dioxide and water into food.

上次我们讨论了光合作用，即植物利用光将二氧化碳和水转化为食物的过程。

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Plants also convert carbon dioxide into different forms of carbon-containing molecules and the conversion process used relies on the very same enzyme that works in humans.

植物也会将二氧化碳转化成不同形式的含碳分子，而转化过程所使用的酶与人体内的酶完全相同。

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Some companies have commercialized a process that captures carbon dioxide and converts it to solid material, but those efforts rely on a chemical process to capture carbon dioxide.

一些公司已经将捕获二氧化碳和将其转换为固体材料的过程商业化，但此类做法还是依赖于化学手段。

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The bioreactors will grow algae that can produce ethanol fuel through a special process that involves using carbon dioxide from nearby coal-burning power plants to promote faster growth of the algae.

VOA: standard.2009.09.02

As well as destroying such native ecosystems, deforestation also diminishes so-called "carbon sinks" -- thereby reducing the Earth's capacity to absorb and re-process atmospheric carbon dioxide -- while also adding to air pollution through the burning of land to clear it for cultivation (sugarcane fields are traditionally fired prior to harvest to remove leaves and drive away snakes).

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During photosynthesis -- the process when the plant absorbs carbon dioxide and gives off oxygen -- organic tissue absorbs airborne toxins.

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EPA, which ruled -- which ruling set in motion the scientific process to determine whether the public health was threatened by carbon dioxide as a pollutant.

WHITEHOUSE: Press Briefing