I wouldn't want to live through an ice age either. Thousands or millions of years ago, having 20 feet of snow year round wasn't a big problem. Neither was having polar ice caps melt. The Earth will survive whatever humans do. But there could be a lot of problems for billions of humans if the climate changes too much.
Humans have the ability to solve problems. Even if the project would be huge, I would want to get started (or at least come up with workable ideas) before it got really bad.
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