Many of us have a gloomy outlook at the future of our world because we are being bombarded with plethora of bad news from all angles (climate change, poverty, diseases, natural disasters, war etc. etc.). I've recently read an excellent book which makes you think a bit differently about our planet and how it has changed over the course of decades and where it is going.
I suggest you give it a read. It is well written and makes good points.
Book: Factfulness: Ten Reasons We're Wrong About the World – and Why Things Are Better Than You Think
have fun