A July 18 AFP story fits the template, relating a study that purports to calculate how much closer the Earth came to the brink of catastrophe, just so you could have that steak for dinner:
The article ends by noting another study that claims organic beef (apparently defined as: the cow ate grass instead of commercial feed) reduces cattle flatulence by 40% and requires 85% less energy consumption.
A kilogram (2.2 pounds) of beef causes more greenhouse-gas and other pollution than driving for three hours while leaving all the lights on back home, according to a Japanese study.
[...] Producing a kilo (2.2 pounds) of beef causes the equivalent of 36.4 kilos (80.08 pounds) in carbon dioxide (CO2), the principal greenhouse gas, Ogino found.
Most of these greenhouse-gas emissions take the form of methane, released from the cow's digestive system.
That one kilo (2.2 pounds) of beef also requires energy equivalent to lighting a 100-watt bulb for nearly 20 days. The energy is needed to produce and transport the animals' feed.
But don't think they'll be satisfied with getting you to switch to grass-fed cattle. All cattle raised for food are considered to be a nonessential source of greenhouse gases, so there's really no way to eat steak guilt-free, so you might as well give it up. Sigh...pass the tofu, willya?