Cars, not cows, are main source of greenhouse gas emissions

Leading U.S. scientists and the EPA say the U.S. livestock sector contributes 4.2% of greenhouse gas emissions, compared to 27% from the transportation sector and 31% from the energy sector.

Contributions by species:

-Beef cattle, 2.2%;

-Dairy cattle, 1.37%;

-Swine, .47%;

-Poultry, .08%;

-Sheep, .03%;

-Goats, .01%;

-Other species, .04%.

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