I don’t think this is universally a reasonable outlook. For example, I’ve become vegan in the last year. It is extremely politically infeasible to legally force a vegan diet on everyone, so individual action is the only way to participate in veganism. However now that I am vegan I can legitimately tell you this: being vegan is super awesome. I no longer contribute to the insane environmental destruction of the beef industry nor do I contribute (with my diet) to animal suffering on the same scale as before.

Individuals deciding to be vegan is a kind of voluntary collective action that should not be forced by the state. I would imagine it is not the only kind.

Realistically an entire change in our culture to reduce consumption is needed. Some of that can come from above (government decision) and some of that must come from below (genuine cultural support).