

Sometimes you have to us big tech to reach more people. Many groups also use Instagram, some also mastodon. But you should certainly not use it for organizing. If they don’t have a signal group or similar, I would stay away.
You could look into environmental groups. On the national level, there are climate defiance and scientist rebellion in the US on a national level (and probably a lot more). Maybe they also have local groups that you could join? Or you could support remotely and start building a local group (that’s hard but someone has to start).
A large group of solar panels is often called a solar farm. Similarly, groups of wind turbines are often called wind farms.