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11 things you thought were green -- but there's a catch

By: Bryan Nelson on March 10, 2010, 10:55 a.m.
Grass-fed beef

Photo: julieabrown1/Flickr

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Grass-fed beef

Grass-fed beef is definitely healthier for you to eat (and grass is better for the cattle to eat, too), but cattle that are fed grass can create as much as 20 percent more emissions from burping and flatulence than grain-fed cattle. As a greenhouse gas, methane is 25 percent more potent than carbon dioxide, and cattle produce a lot of it. The bottom line: No matter how you grow the beef, eating vegetarian is likely better from a carbon point of view.