> You cannot address climate change without drastic long term reduction in human activity/population.

Completely disagree. Reducing waste, recycling waste, and re-using waste are some of the ways to address climate change. Saying modifying human activity/population is the only way to solve a problem is as extreme as saying climate change isn't real.

> No business is out there emitting methane for shits and giggles.

No one says this, you're reducing the broader point to a poor cliff-note. The point is that the incentives for businesses to better address their waste are not there. If all one gets for managing waste responsibly is a higher bill every month and a good feeling in their stomach, why would a proper capitalist businessperson do that in the short term?