What is the greenhouse effect and which gases are important?Methane is the next of the greenhouse gases which has the biggest effect on global warming (15%) This is generated by activities such as livestock production, agriculture, sewage treatment, natural gas and oil distribution, coal mining, fuel use and is also given off from waste tips It lasts an average of 12 years in the atmosphere For example, water vapor is the most abundant greenhouse gas, but carbon dioxide has a more significant impact on global warming due to its abundance in the atmosphere plus its relatively long
Greenhouse Effect 101 Nrdc