Our good friend Mary Woodbury has created a subreddit devoted to Ecofiction:
A place to find meaningful fictional stories about our natural world and humanity’s connection with it. The subreddit explores the wild, crazy, and breathtaking literary trail of ecofiction. Our motto is “blowing your mind with wild words and worlds.” We hope to raise awareness of the impact of, and diversity in, storytelling around the world that explores climate change and related ecological themes.
There’s a megathread where you can promote your own work (fiction only please).
Also, you’ll find mentions of must-read books, events and writing opportunities.
Check it out (and contribute) at https://www.reddit.com/r/Ecofiction/