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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Nowadays scientists are finding light pollution can be almost as bad as carbon dioxide pollution.

如今科学家们发现光污染几乎和二氧化碳污染一样有害。

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What's the carbon footprint of a can of Miller Light?

生产一罐米勒淡啤酒的碳足迹是多少？

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Plants naturally take in carbon dioxide they need for photosynthesis, the process of changing light energy to chemical energy.

VOA: special.2010.01.26

Crops need a sheltered environment, protected from the extreme temperatures and frightening levels of radiation found on the moon's surface, with water, carbon dioxide and light.

CNN: To boldly grow where no one has grown before

Corals 'bleach' when they are under stress, which typically has been caused by an increase in sea-surface temperatures (but which could be also brought on by variations in light, carbon dioxide (CO2) levels or pollutants).

CNN: All About: Coral Reefs

First up, while carbon fiber is strong and light, it also lacks a certain rigidity.

ENGADGET: Gigabyte X11 review: slim and powerful but not without flaws