But in the 250 years following the start of the Industrial Revolution, enough CO2 built up to bring the average concentration to nearly 394 ppm in 2012.
例えば、二酸化炭素は少なくとも過去には今日のように急速に大気に添加されていない66m年。
For instance, carbon dioxide hasn't been added to the atmosphere as rapidly as today for at least the past 66m years.
二酸化炭素は結局のところ、植物の成長にとって基本的な促進要素のひとつなのだ。
After all, CO2 is an essential ingredient for plant growth.
Astronauts would breathe out carbon dioxide, that carbon dioxide would then be captured by the microbes and converted into a nutritious, carbon-rich crop.
Carbon dioxide's low reactivity, however, has been an obstacle to research and development of an efficient catalytic system for CO2 fixation reactions.
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