If we destroy our planet or just ourselves, the universe won't give a shit. Just like we don't care about a random ant colony on the other side of the world.
Explain to me how our problems are supposed to be solved by talking to the sky? Clearly the sky is full and has infinitely greater things going on than our petty grievances or even than our legitimate concerns.
We only have one tiny part of the universe to use. If we're going to continue our existence, we need to stop relying on an invisible hand to bail us out of our own mistakes at the last minute and instead just fix things ourselves. Even if God does show up, He'll certainly be happier if we get our act together and behave like rational creatures than if we just make a mess and wait around for Him to clean it up. If He's up there, He is clearly busy.