There's a Reasons to be Cheerful website and mailing list. Instantly see some positive news - it's rather good - Find out more at reasonstobecheerful.world.
Hannah Ritchie is a very smart, positive, and well-informed young person. Her self-description: I’m a data scientist and science communicator. I focus on the largest problems that shape our world, and how to solve them. She wrote "Not the End of the World" and is behind the "Our World in Data" website.
There's some very inspirational humans and organisations out there. Take Bob Brown, Greta Thunberg, Planet Wild.
Check out the Knitting Nannas good news