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Finally, a global warming solution. Then we send these balloons to Mars or something.
It's even easier than that - burn it for heat. It sounds bad, but it just produces water and a much smaller volume of CO2. Less greenhouse gas already, but then if you really wanted you could capture the water and CO2 and funnel it into a hydroponics greenhouse for food production - but even just burning methane and releasing directly into the atmosphere reduces emissions, and CO2 can be removed naturally much more readily than methane.
how to burn farts safely?? I don't want to set the cows on fire.
Two solutions in one - steaks! /j
A serious answer: ultra-fancy cow-fart-diaper that allows solid matter to pass through a tube, but pulls a light vacuum with a fan whenever flatulence or waste is passing through the device to remove the methane to a very small holding tank. Pressurize holding tank, use sensors to indicate when the tank is full. Swap tanks automatically (2 on the cow diaper at all times), drop the tank, send radio beacon for a small maintenance robot to pick up the deposited container and deliver a new backup container. Repeat indefinitely, have the robot swarm deliver deposited tanks to a methane refinery on the farm to be used for heating and power a generator to charge the robots etc. Use idk one robot to 10 cow-fart-diapers (would take some research to find a good scale), scale up with the herd.