That doesn&#x27;t really contradict adrianN&#x27;s point in any way.  If you integrate methane&#x27;s heat retention over now to 100 years from now it still beats carbon dioxide.  That doesn&#x27;t mean that if you integrate from 50 years from now until 100 years from now it would still win.  Much less so if you look at a geological time period in the future.