Just about anything by anyone serious about climate, who realises the scale of what must be done, and the power of vested interests to keep making profits come what may, and damn the consequences.
The Drilled podcast by @amywestervelt is excellent.
Season 5 of the Scene On Radio podcast with Amy and John Biewen is a must listen.
Greta speaks a lot of truth. She's got a book out I think.
Peter Kalmus (NASA Climate Scientist) wrote a book "Being The Change. Live Well and Start a Climate Revolution" and it's a good place to start. You can buy a copy or read it free on his website here: