如果没有二氧化碳，地球将冻结。
氢气由于它大量的存在于水分子之中并且在燃烧时没有二氧化碳的产生而最有希望替代汽油的燃料。
HYDROGEN holds out hope as an alternative fuel to petrol for transport because there is plenty of it about in the form of water and no greenhouse gases are produced when it is burned.
这种限制事实上将许多非洲国家(尤其是非洲国家)排除在外，因为它们没有二氧化碳减排额度可卖，它们的主要资源是森林。
The restriction has meant that many African countries, in particular, have been shut out, because they don't have CO2 reductions to sell; their main resource is forests.
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