And Methane decomposes into CO2 and Water. So Methane is, in sum, always worse than the same amount of CO2.
Methane (CH4) causes 80-100X the radiative forcing than CO2. So even though CO2 levels are >400 ppm and CH4 is "only" 2 ppm (natural levels are about 1/3 of that) the rise of methane levels is estimated to be responsible for a temperature rise of about 0.5 C -- in other words a third of anthropogenic temperature rise.
Which is why the carbon needs to stay in the ground. But we're taking it out and pumping it into the atmosphere as fast as we can so that we can get a new iPhone every year.