October 24, 2008—Cow's emissions of methane, a greenhouse gas, can be reduced with a more natural diet, farmers are learning. Methane is a powerful contributor to global warming.©
2008 National Geographic (AP)
Get our news delivered directly to your desktopfree.
How to Use XML or RSS
SPACE PHOTOS THIS WEEK: Tiny Galaxy, Sun's Iron, More
Stuck Mars Rover About to Die?