Greenhouse effect leads to global warming. Which substances are responsible for greenhouse effect?
There are various greenhouse gases out of which some are produced naturally, and some are man-made. Methane is a natural gas which is produced when vegetation is burnt or digested or rotted in the absence of oxygen. Paddy fields, coal mines, fossil fuel and rotten garbage, release large amounts of methane into the atmosphere.
Nitrous oxide occurs in the environment naturally but is increasing due to human activities day-by-day.
CFCs (Chlorofluorocarbons) are man-made and used in ACs. They contribute to greenhouse gases, too.