Among vehicles and fossil fuels, cows are a top producer of methane, a greenhouse gas. But researchers in the UK have found a way to make the cows less gassy. In turns out that tumeric and coriander, two additions in curry, kill methane producing bacteria in cow stomachs. The study concludes that by adding these spices to feed, farmers could reduce methane emissions by 40%.
http://www.popsci.com/science/article/2010-07/seasoning-feedstocks-curry-spices-cuts-methane-emissions-livestock-40