Methane spends a lot less time in the atmosphere than carbon dioxide; about 20 years after it’s released, most of it will have decayed, while carbon dioxide lingers in the atmosphere for hundreds of years. But methane also generates heat much more readily than carbon dioxide — about 80 times more in its first 20 years in the atmosphere — meaning it contributes significantly towards global warming in the short term. It is good news — sort of — because by the same token, any reductions in methane emissions will have more of an impact on the climate right away.
Yes, this would be very easy compared with many other problems we are facing.
Our society in its current way relies a lot on cars. Far travels are not yet easily possible without planes. Electricity is not easily replaced (needs some time to build, we need batteries etc.). And we need to tackle all these problems and face the challenges that come with it. But food is so easy. We just need to change some optics of food. We wouldn’t even lose any nutritional value (we would even gain so many health advantages) but people insist on having tortured animals in their food instead of the same nutrients and taste provided by plants.