Methane levels in the atmosphere seem to be rising steeply. Since methane is a much more potent “greenhouse gas” than CO2, this could, perhaps, maybe, result in the end of the ice age that we’re currently in… within a few decades. The one good thing is that methane does not have a long lifespan, getting oxidized within a few years. But that’ll only help if the methane release – which seems to be coming from African wetlands – stops. of course, if the climate suddenly gets way hotter, the African wetlands releasing methane via decomposition of dead vegetable matter might turn into desert area, resulting in the eventual end of the methane release. Which means within a dozen or so years of that the methane will have burned out and the climate can descend back into good ol’ ice age status. *Proper* ice age, with glaciers covering continents and land bridges everywhere. This will be aided by the fact that humans will have been largely wiped out at that point. Doubtless industrial civilization will have either moved off-world or simply been exterminated; and with no easy access to oil or coal anymore, anthropogenic CO2 emissions will be minimal.
Yaaaaaay.