To my surprise, eliminating net CO2 emissions from the economy in just 20 years is actually pretty easy and pretty cheap, not very cheap, but certainly less than the cost of a collapsing civilization.
出乎意料的是 在二十年内消除经济中的二氧化碳净排放 其实挺容易的，代价也不高。 虽说代价也不是特别低， 但总比文明毁灭的代价小得多。