[Southerngl]

So we would use Methane gas? Isn’t this the process he perfected? And doesn’t methane gas increase CO2? I’m so confused.

[Drammach]

Methane made from biomass would be "carbon neutral".
Actually, the carbon output would probably be less than the input, with the processed waste retaining a good chunk of the carbon.
Seems to me, the waste product is probably useful as a fertilizer, or can be further processed to provide other products.

As an aside to this, North Dakota takes brown lignite coal, extracts the methane, (along with other gaseous and solid components) and creates LNG, or Liquid Natural Gas.
That gas powers power plants as far away as the east coast.

As noted above, other products include butane, propane, fertilizer compounds, and, CO2, which is shipped to Canada and sequestered in the tar oil fields deep underground.