I mean really what else is there? We can't undo the warming, we can't rebuild every building in Europe (even if we could, would it work? Winter will still happen too). We can install solar panels and air conditioners, though.
We can update building regulations so that new building are better.
We can plant trees. It brings shade in summer but lets sun through in winter.
We can stop taking the plane.
I mean, there really are tons of things to do!
If everyone does this, hopefully the problem will be fixed quickly, plus you can enjoy all the guilt-free AC you want!
I know I will need an AC one of those years but for now this is fine for home working.