Few fascists call themselves fascists. But ecofascism is mostly used as a descriptor for policies and policy priorities that are genocidal in the name of ecology, even though the proponents may be non-fascist in other areas.

For example, a neoliberal legislator may cut foreign aid because it's going to industries that emit carbon, while simultaneously cutting public transit funding to promote driving. Or a neoconservative may increase the funding for border police by a massive amount because climate change will lead to an increasing number of climate refugees.

have you ever heard of the tragedy of the commons? because it was coined by an ecofascist and has inserted itself deep into economic theory. ecofascists are few, just like all fascists, but their ability to ply power allows them to influence world decisions by seeming reasonable while they murder, kill, and disrupt

I don't think they advertise much irl, but you can certainly find them in the darker corners of the web. If I recall correctly, it started as an academic term to describe the emerging ideology. Some of them view the term negatively, others have embraced it.

It's a cool-sounding buzzword to use against people concerned about the environment so you can sound like a leftist while protecting overconsumption.