> They can eat grass. But they don't. They eat corn that is subsidized by the government

Putting aside the ridiculousness of the Big Agra's bedroom activity with the Government, what's your point? Corn is a type of grass after all. The same rules apply. If there's a problem with how corn in particular is raised and transported for cattle feed, that's really not central to whether raising cattle is bad for the climate in and of itself. Cattle can and are fed on grass all the time, even in cases when the cattle is grain-fed in the months before they are slaughtered.

> It's a fact that Americans eat more meat than they should

According to whom?