Even if you think it's all a hoax, why shouldn't we still do what we can to make the air, water, food supply, etc, etc cleaner if not better/safer?
We absolutely should do what we can to make the air, water, food supply, etc, etc cleaner/better/safer. Within reason.
The private sector can handle that. You could make a large fortune by solving a problem of that magnitude and a lot of people are trying. Elon Musk is one major player.
What we should
not do is impose harsh regulations on individuals and businesses. Those are solely intended to punish and loot money from us, and they will have an extremely negative impact on our economy.