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It is a serious threat but if we keep developing our economy and space technologies it will become much easier to fix eg launch lunar dust so we don't need to do any more yet.

We have always coped with change and while a faster rate of change will pose challenges we will cope (or have to cope) with those challenges rather than deciding on some large effort to fix global warming.

While a serious threat, we are exceedingly fortunate that solar and wind turn out to be cheaper than fossil fuels and economics will mainly fix the problem to an adequate extent such that not much other serious effort or much in way of sacrifices is needed.