If you share in people's miseries, you will typically share their joys if you stick with them. The victories are harder fought but are nevertheless, victories.

I've been in the fight with people for a long time and it's been an absolute honor and pleasure. Sometimes, it has even been fun.

Maybe you won't stop the Earth from getting way too hot, but regular, everyday heroism is amazing too. Run that charity race, make those knit caps for people getting cancer treatments, give blood. It's all worthwhile.