The green represents the need for an emphasis on ecological change, whilst the black is in reference to the black anarchist flag (here’s some historical context.
The red 8-sided asterisk represents the urgency for communities to cooperate in ridding eco-fascism. I picked the 8-sided one to represent the worldwide need for change.
Hmm, it’s also the color for stop. What color would you use for fascism, it’s mostly black which conflicts with anarchism, or perhaps brown. I think the wide solarpunk umbrella is more important than the communism, but YMMV.