Landfills sequester carbon on the net, and release enough methane (at first) that it's practical to turn it into electricity. That compares favorably with any other pathway for waste.

Reducing waste is good as well, this law is a silly way to do it.

GW is not about human heat production, which is insignificant compared to the sun, it is only about GH gasses which trap a bit more heat from the sun which amounts to vastly more heat than humans produce.