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。

Scientists say that the scale of CO2 emissions will require vast amounts of long-term storage.

科学家表示，二氧化碳的规模排放将需要大量的长期储存。

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。

"We see the potential for capture and storage to play an integral role in reducing emissions," says Kim Corley, Shell's senior advisor of CO2 and environmental affairs.

“我们看到捕获和储存二氧化碳在减少排放方面发挥整体作用的潜力。”壳牌二氧化碳和环境事务高级顾问 Kim Corley 说。

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。

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。

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。

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。

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。

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。

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。

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。

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%。

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。

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！

They have saved 0.3 km2 of rainforest, cleaned up million kg of CO2, sent 22,000 books to Africa, and bought 20,000 kg of rice for people without enough food.

他们拯救了0.3平方公里雨林，净化了一百万公斤二氧化碳，给非洲赠送了两万两千本图书，并为缺粮少食的人购买了两万公斤大米。

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。

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。

In the Netherlands, Shell delivers CO2 to farmers who pipe it into their greenhouse, increasing their yield of fruits and vegetables.

在荷兰，壳牌公司向农民们输送二氧化碳，农民们将其排入他们的温室，从而提高了他们水果和蔬菜的产量。

Ian Smith, a Ph.D. student of Boston University in the United States, said, "Cities are in the important position in fighting against rising temperatures and increasing CO2."

美国波士顿大学的博士生伊恩·史密斯说：“城市在对抗气温上升和二氧化碳增加方面处于重要地位。”

A study by the University of Manchester calculated the emissions of CO2—the main greenhouse gas responsible for climate change—at every stage of microwaves, from manufacture to waste disposal.

曼彻斯特大学的一项研究计算了二氧化碳（造成气候变化的主要温室气体）在微波炉生产的每个阶段的排放量，从产品制造到废物处理。

The Weyburn-Midale CO2 project is burying carbondioxide from a coal gasification plant in a depleted oil field.

维本市—米代尔 CO2 项目正将煤气化厂排放的二氧化碳埋入一个废弃的油田。

The main compositions of supercritical CO2 fluid extraction product of Foeniculum vulgare Mill. seeds are anethole and fatty acids.

小茴香超临界 CO2 萃取产物的主要成分是茴香脑和脂肪酸等。

But where did the CO2 come from?

但是这些二氧化碳从哪里来？