In this March 11, 2009 file photo, a line of Holstein dairy cows feed through a fence at a farm outside Jerome, Idaho One contributor to global warming _ bigger than coal mines, landfills and sewage treatment plants _ is being left out of efforts by the Obama administration and House Democrats to limit greenhouse gas emissions. Cow burps.
In this March 11, 2009 file photo, a line of Holstein dairy cows feed through a fence at a farm outside Jerome, Idaho One contributor to global warming _ bigger than coal mines, landfills and sewage treatment plants _ is being left out of efforts by the Obama administration and House Democrats to limit greenhouse gas emissions. Cow burps. Charlie Litchfield ASSOCIATED PRESS
In this March 11, 2009 file photo, a line of Holstein dairy cows feed through a fence at a farm outside Jerome, Idaho One contributor to global warming _ bigger than coal mines, landfills and sewage treatment plants _ is being left out of efforts by the Obama administration and House Democrats to limit greenhouse gas emissions. Cow burps. Charlie Litchfield ASSOCIATED PRESS

Cows producing greenhouse gas? New study suggests we may have underestimated how much

October 01, 2017 06:38 PM