One of the most popular items on the BBC news website at the moment is the interview of Prof. James Lovelock on Radio 4.
According to Prof. Lovelock, of the Gaia theory fame, planet earth will take care of itself, with or without humans. Indeed there’s nothing that humans can do to save the planet. It is humanity’s hubris that humans presume the ability to save earth at all.
We’re all doomed, so enjoy whatever time we are left with! Now, that should cheer you up.