Can someone please cheer me up

SMILEEE! Life is too precious to be spent worrying about things like this. Worrying doesn't do anything anyway! The world's climate does need fixing but no one will do anything about it until it's truly unavoidable due to both conformity and transaction costs. As for overpopulation, there are always laws that will help with that. For example, did you know that China has a law that you can only have one children? It's illegal otherwise! Besides, there are still millions dying every day so it's fairly balanced! You'll be okay! The world doesn't rest upon your shoulders so for now, maybe join a group that supports clean air and saving the forest to make yourself better! Don't forget that people aren't entirely stupid. We're not going to send our entire race to hell just like that! :)