If you're a carnivore with an eye toward environmentalism, your best
bet is to eat more chicken. According to a 2005 study published by
Earth Interactions, cattle accounts for over 67 times more non-CO2
greenhouse gas emissions, including methane gas and nitrous oxide,
than its feathered counterpart. Not only that, but one pound of beef
also requires a significant amount more feed and water to produce
than an equal weight of chicken.
Go whole hog: Become a vegetarian.