We cannot let the CO2 in the atmosphere rise indefinitely.
我们不能让大气中的二氧化碳无限制地升高。
Some propose storing the CO2 in coal mines or liquid storage in the ocean.
一些人建议将二氧化碳储存在煤矿中，或以液体状态储存在海洋中。
Dakota Gasification of North Dakota captures CO2 at a plant that converts coal into synthetic natural gas.
北达科他州的达科他气化在一个将煤转化为合成天然气的工厂捕捉二氧化碳。
In 1998, energy consumption in the transport sector was to blame for 28% of emissions of CO2, the leading greenhouse gas.
1998年，运输业的能源消耗导致了28%的二氧化碳排放，而二氧化碳是主要的温室气体。
"As long as we're consuming fossil fuels, we're putting out CO2," says Klaus Lackner, a geophysicist at Columbia University.
“只要我们还在消耗化石燃料，我们就在排放二氧化碳。”哥伦比亚大学的地球物理学家克劳斯· 拉克内说。
In the meantime, the amount of CO2 in the air is rapidly approaching the limits proposed by the Intergovernmental Panel on Climate Change (IPCC).
与此同时，空气中的二氧化碳含量正迅速接近政府间气候变化专门委员会（IPCC）提出的上限。
That sense of urgency has increased interest in capturing and storing CO2, which the IPCC says could provide the more than 50% reduction in emissions thought needed to reduce global warming.
这种紧迫感增加了人们对捕捉和储存二氧化碳的兴趣，政府间气候变化专门委员会表示，这可以使排放量减少50%以上，人们认为这是缓解全球变暖所需的。
One way to make such fuels is to get CO2 from the air and put it in water.
制造这种燃料的一种方法是从空气中获取二氧化碳并将其放入水中。
Try to take bicycles and public transportation to school instead of cars because it will make less CO2.
尽量骑自行车或乘坐公共交通上学而不坐小汽车，因为它会产生更少的二氧化碳。
This will make a lot of CO2 into the air.
这将使大量的二氧化碳进入空气中。
After burning, it changes into water and CO2.
经过燃烧，它变成了水和二氧化碳。
The CO2 that astronauts breathe out is sucked away.
宇航员呼出的二氧化碳被吸走了。
One is to plant more trees to absorb the emitted CO2 .
一种是种植更多的树木来吸收排放的二氧化碳。
Trees can take in CO2 in the air and stop global warming.
树木可以吸收空气中的二氧化碳，阻止全球变暖。
The other is to stop CO2 emissions altogether by using non-fossil fuels.
另一种是通过使用非化石燃料来彻底停止二氧化碳排放。
Cities do better in fighting against rising temperatures and increasing CO2.
城市在应对气温上升和二氧化碳增加方面做得更好。
They give off a lot of greenhouse gases (especially CO2) into the air. This warms the earth.
它们向空气中释放大量温室气体（尤其是二氧化碳）。这使得地球变暖。
Being carbon neutral means taking away the same amount of CO2 from the air as you put into it.
碳中和意味着从空气中吸收的二氧化碳量与向空气中排放的二氧化碳量持平。
You may think Mars is warm enough to live; however, the atmosphere is very thin with CO2 over 95%.
你可能认为火星足够温暖，可以生存；然而，火星的大气非常稀薄，二氧化碳含量超过95%。
At the same time, about 10% of all CO2 on the Earth is from activities that produce the food waste.
与此同时，地球上约10%的二氧化碳来自产生食物垃圾的活动。
Since a plant uses it up in the air around, the plant needs moving air to bring more CO2 close to its surface!
由于植物会将周围空气中的二氧化碳耗尽，因此需要空气流动将更多的二氧化碳带到其表面！
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