但如今，潜在的问题是二氧化碳过多。
Today, however, the potential problem is too much carbon dioxide.
而二氧化碳过多的话，金星可以热到能融化铅的地步。
With an excess of carbon dioxide, Venus is hot enough to melt lead.
排放过多温室气体，如二氧化碳，是全球变暖的根本原因。
Emitting too much greenhouse gases such as carbon dioxide lies at the root of global warming.
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