Methane makes up less than two parts per million in the atmosphere. If everyone at the Rose Bowl represented one molecule, odds are there would be no methane molecules represented.
RRTM, the radiative transfer model used by NCAR, shows that a 10X increase in methane would increase downwelling longwave radiation in the tropics by just over 1 w/m², or about 0.25%.
Methane also quickly oxidizes in the atmosphere.
In other words, fearmongering about methane is bullshit.