Also "living in traditional ways" is at best misleading. There is already more than enough to go around when we consider actual physical resources. Using market mechanisms to determine how things are distributed works very poorly in terms of meeting everyones needs, and blinds us to actual solutions.

The idea of overshooting earths capacity is firmly rooted in extractive ideology (which is a cornerstone of capitalist economies) and doesn't even begin to consider how an adjustment in economic output to meet real demand and not whatever is the most profitable, would result in massive changes in the way we do things.

Food production could become more regenerative because we need to feed people not make money.

Clothing industries would cut gigantic amounts of waste simply by ceasing the destruction of clothing to maintain high prices.

And these 2 ideas alone could revolutionize nearly every aspect of our existence.

Indigenous ways of doing is not extractive. It is better described as a collaboration with nature. Managing natural resources to meet our needs, and the needs of (often specifically) the next 7 generations. It means managing forests to make more forests, with all the flora and fauna that entails. Among other things

The fascist part is:

Ohh humans are the problem Okay, which humans? Who decides who gets what? Who lives and who dies? Is there any consideration for the power dynamics in our society (spoiler, no there is not)

In short the quote who ever said it:

Environmentalism without class struggle is just gardening.