Think globally, act locally
As said by Paulie Shore in his environmental documentary Biodome.
If everyone did that we'd be fine as a species, but not enough do. Don't get so stressed out about the stuff we can't change to not help change stuff you can.
Our brains don't care about the scale, it'll help if you do something no matter how small.
And that gives you the mental bandwidth to care about big shit again.
You have to moderate how many fucks you give or you'll run out.