Methane is one of the gases involved in the greenhouse effect, with a potential exceeding that of notorious carbon dioxide by 25 times. Its atmospheric concentration, however, is 210 times less, so its contribution to the greenhouse effect is a mere 12% of carbon dioxide's.
"When fascism comes to America, it will be wrapped in the flag and carrying a cross." - Sinclair Lewis
"Those Who Would Sacrifice Liberty for Security Deserve Neither." -Benjamin Franklin