I'm sure a single human emits as much or even more. Bedsides, airplane burgers are taste terrible - with or without bolts. (I'll take a 15-ton cargo ship - with extra onions and pickles, and hold the mayo, please).
There are loads of methane under the ice, it won't stay there forever due to global warming. Once it begins to be released in mass quantities, well, it won't be a good thing.
Once the ice melts to the point we can reach it, (which it will as we are at the end of the ice age) our gas companies will be drilling it. It also dissipates very quickly.
I am not a big steak fan. I will eat it. But I am the person who goes to the steak house and orders it extra well done. This will cause the waitress to offer you ketchup, lol.
Medium well is as done as is edible. My better half likes it the way you do, ie slightly less tender than boot leather. A little pink in the middle is fine, as long as the juice runs clear. My wife says steak that way is still mooing.
I read an article today that was encouraging. Seems that the methane leaks have become visible via satellite. I can't remember now who the largest offenders were but it was pipelines and mining operations. The satellite didn't pick up a single occupied pasture though. If I see the article again I'll come back with it.