You are double counting in multiple different ways.
Over 100 years it’s 80x for years 0-19 years and 15x for years 20-99 which averages to 28x by weight. Largely because 1 ton of methane turns into almost 3 tons of CO2.
Except when you start with CO2 at 44.01 g/mol it turns into CH4 at 16.04 g/mol you only get 16.04/44.01 ~= 36.4% as much methane and thus 36.4% of that global warming.
Net result for years 0-19 it’s 29x as bad and years 20-99 it’s 5.5x as bad. And considering the relatively trivial amount of CO2 released as methane vs sequestered in landfills they are a massive reduction in climate change.
Over 100 years it’s 80x for years 0-19 years and 15x for years 20-99 which averages to 28x by weight. Largely because 1 ton of methane turns into almost 3 tons of CO2.
Except when you start with CO2 at 44.01 g/mol it turns into CH4 at 16.04 g/mol you only get 16.04/44.01 ~= 36.4% as much methane and thus 36.4% of that global warming.
Net result for years 0-19 it’s 29x as bad and years 20-99 it’s 5.5x as bad. And considering the relatively trivial amount of CO2 released as methane vs sequestered in landfills they are a massive reduction in climate change.