“Methane is considered to be twenty times more harmful a greenhouse gas than carbon-dioxide.”
“harmful” = a classic case of begging the question.
“20 times more harmful...”, which means it’s still far, far, less effective than water vapor, plumes of which I see almost every day.
You used the phrase “begging the question” correctly!
Methane is also flammable, and breaks down into far less than 20 times as much CO2, so why not bottle up as much methane as possible to get cheap gas for my new portable folding gas stove/grill?