I'd actually say climate/environmental news has had an optimism bias because there was a strong strain of thinking reporting on how dreadful certain things are would cause people to give up. I'd say Mongabay is mostly focused on solutions but does not shy away from covering environmental injustices.

If you want something more hopeful, it's hard to suggest news in general, but I really like Shareable's focus on community solutions https://www.shareable.net/stories/

And I also enjoy updates from certain orgs that are actually doing projects:

- Andrew Millison taught permaculture at Oregon State and then worked for the United Nations. His channel is an incredible gallery of amazing climate solutions around the world: https://www.youtube.com/@amillison/videos

- Mossy Earth is a nonprofit that does a lot of cool restoration and rewilding projects that have had tremendous success: https://www.youtube.com/@MossyEarth/videos

- Ecosia (yes the search engine) also does similar work. They collaborate with a lot of nonprofits around the world so its also a good jumping off point to find other groups: https://www.youtube.com/@Ecosia/videos