There have been a few green discussions in this forum recently. I thought this article from the Conversation was interesting on a different philosophical approach to doing just a little bit.
theconversation.com
For my own part, I keep on doing little bits, and that can be depressing that it is not a big bit. I do also see people saying on various websites that it is all too big a problem to fix, and I try to persuade them that a little bit is worth it. So was particularly pleased to see the article.

Think your efforts to help the climate don’t matter? African philosophers disagree
None of us act in isolation – and our choices have more influence than we think.

For my own part, I keep on doing little bits, and that can be depressing that it is not a big bit. I do also see people saying on various websites that it is all too big a problem to fix, and I try to persuade them that a little bit is worth it. So was particularly pleased to see the article.