Atmospheric methane has increased nearly 150% over its preindustrial levels. As for your "no meaningful change in the last 25 years", that's as untrue as the other climate change denier talking point that there has been no warming for the past X years, where X is whatever integer the 'skeptics' pull out of their hat.

So let's look at methane concentration over the most recent 25 year period, shall we?

1739.4 ppb in January 1992
1851.4 ppb in January 2017
https://www.esrl.noaa.gov/gmd/ccgg/trends_ch4/#global

Right, sure... nothing to see there, move along.