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The issue isn't that the problem isn't solvable, there are tons of things that have huge environmental benefits. The problem is that these generally require some sacrifice (e.g. denser housing with much smaller lawns, eating more resource efficient foods like lentils, moving away from fossil fuels) but there's not sufficient collective will for actually doing these things.
Secondly, these things will change. If you look at the history of activism often there are people advocating against things hundreds of years before we see large changes (there is activism against forced labor in the Americas in the early 1500s even). So I've found it useful to accept the idea that we'll pass down this fight to the next generation and they'll probably pass it down to the one after that. It could be three decades or it could be three centuries but eventually things will change.