碳的化合价是4价。
另一种方法是用从空气中吸收碳的植物来制造这种燃料。
Another way is to make such fuels from plants which take in carbon from the air.
如果你仔细观察，你会发现这是三种不同形式的碳的混合物。
If you look more carefully, you will find that this is a blend of three different forms of carbon.
剩下的树木吸收了更多的可用水分，因此它们茁壮成长，恢复了森林从空气中吸收碳的能力。
The remaining trees draw a greater share of the available moisture, so they grow and thrive, restoring the forest's capacity to pull carbon from the air.
要想让森林成为有价值的“碳汇”并一直持续到未来很长一段时间，就需要降低它们现在吸收碳的能力。
Helping forests flourish as valuable "carbon sinks" long into the future may require reducing their capacity to absorb carbon now.
放射性碳年代测定法涉及到了化学分析，与文物中残留的有机物成分所释放的放射性碳的含量测定有关。
Radiocarbon dating had to do with chemical analysis, something to do with measuring the amount of radiocarbon that's left in organic stuff.
目的是合成含2-5个碳的直链烷酸功能基的5-氟尿嘧啶衍生物。
The objective is to synthesize 5-fluorouracil derivatives containing 2-5 carbon alkanoic acid.
一切取决于你如何统计碳的产出。
为何碳的价格始终没有更大降幅？
人们不得不习惯选择低碳的方式。
因此最终我们得到碳的形式电荷量是负一。
这是碳的数量,这是一摩尔的碳。
“如果不能减少碳的排放，就是失职，”他说。
"If you're not reducing carbon, you're not doing your job," he said.
“如果不能减少碳的排放，就是失职，”他说。
“If you're not reducing carbon, you're not doing your job,” he said.
碳的循环在学校教科书中已经讲过了。
红树林的的根系可以起到隔绝碳的作用。
The mangrove forest also sequesters carbon dioxide in its root system.
第二点是，我们将生活在限制碳的世界中。
The second prediction is that we will live in a carbon-constrained world.
但其关键在于劝阻人们使用高碳的化石燃料。
But the main point is to discourage the use of high-carbon fossil fuels.
他认为日本可以带领亚洲各国走向低碳的未来。
产生黑碳的，是柴油机与烧木材牛粪的原始炉子。
Black carbon is produced by diesel engines and primitive stoves burning wood and cow dung.
企业制定了碳的排放标准，以简化对消费者的责任。
Companies are developing a standard measure for products' carbon emissions in hopes of simplifying decisions for consumers.
钢是铁与碳的合金，焦煤便是熔炼过程中碳的来源。
Steel is an alloy of iron and carbon. Coking coal is a source of carbon in the smelting process.
尽管这十分奇怪，因为这样是一种对有用的碳的浪费。
That would be odd, though, since it would be a waste of valuable carbon.
在冰岛，一个叫固碳的试验计划正在测试这个想法的可行性。
A pilot project called CarbFix, intended to test this idea, is under way in Iceland.
对排放碳的商品征税，所以这些商品的价格和普通商品一样。
Tax carbon-emitting goods so they cost the same as normal goods.
此外，地球——尤其是海洋吸收碳的能力远远低于我们的假设。
Also the ability of the planet, particularly the ocean, to absorb carbon was less than we assumed.
问题是“进口碳”，这是我们的产品进入该国后部分碳的足迹。
The issue is "Imported carbon," which is our portion of the carbon footprint of the products we import into the country.
问题是“进口碳”，这是我们的产品进入该国后部分碳的足迹。
The issue is "Imported carbon," which is our portion of the carbon footprint of the products we import into the country.
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