61. The practical conclusion is that if global warming is a potential disaster, the only solution is new technology.
主干：The conclusion is that...
解析：that 引导的从句在句中作表语。该表语从句中包含if 引导条件状语从句：要是......。
译文：比较实际的结论是，如果全球变暖是一个潜在的灾难，那么唯一的解决办法就是新技术。
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