It's caused by cow burps and farts.
All we have to do is fit all global food chain livestock with oral and anal methane collectors. No more cow farts and burps released into the atmosphere = massively reduced threat of the threat.(?) Think of the jobs created building the collectors and hiring teams to fit them to all the cattle and periodically collecting the methane for burning in power plants.
Then build a giant metal space sun screen to give Earth's magnetic field a breather on weekends.
