Star-Ledger: It turns out “going green” may mean cutting back on those juicy steaks and burgers. The reason: Cattle and other livestock expel tons of methane gas, which wreaks havoc on the environment. The issue has become so heated, the U.S. Environmental Protection Agency has proposed taxing cows as a way to regulate greenhouse gas emissions under the Clean Air Act — a suggestion that rankles dairy and cattle farmers. Pete Staats, whose family has owned Dutch Hollow Farms in …