We don't know how scientific it will be, but the McDonald's fast-food chain is reportedly investigating ways to reduce greenhouse-gas emissions from cow flatulence.

"McDonald's believes it can use the results of its study, the first of which are due in April, to help suppliers reduce methane through changes to farming practices," The Daily Telegraph in England reported on Jan. 10.

Last April's Nutritionist e-Network included an article about using fish oil in the diet to reduce methane emissions.