What are the greenhouse gases?

Water vapour

is the most common greenhouse gas. But others that are very important
too. Some occur naturally and some come from human activity
Carbon Dioxides
or CO2 is the most significant greenhouse gas released by human activities, mostly through the burning of fossil fuels. It is the main contributor to climate

change.

Methane
is produced when vegetation is burned, digested or rotted with no oxygen present. Garbage dumps, rice paddies, and grazing cows and other livestock release lots

of methane

Nitrous oxide
can be found naturally in the environment but human activities are
increasing the amounts. Nitrous oxide is released when chemical fertilizers and manure

are used in agriculture.

Halocarbons
are a family of chemicals that include CFCs (which also damage the ozone
layer), and other human-made chemicals that contain chlorine and fluorine.