There are many types of greenhouse gases. These gases occur naturally in the environment and also from human activities. Some of the most common types of greenhouse gases are:

a) Water vapor- this is the most abundant greenhouse gas in the environment. It reaches the atmosphere through the evaporation from oceans, lakes and rivers.

B) Carbon Dioxide- this is the second most abundant greenhouse gas. It circulates in the environment through a variety of natural processes known as the carbon cycle

C) Methane- this is emitted into the atmosphere during mining of coal and the production and transportation of natural gas and oil. It also comes from rotting organic matter in landfill as well from certain animals such as cows as a by product of digestion.

D) Nitrous Oxide- this is a potent greenhouse gas that is released primarily by plowing farm soils and burning fuels.

E) Ozone- Ozone in the lower atmosphere is a component of smog, a severe type of air pollution. This low-altitude ozone is a greenhouse gas formed by nitrogen oxides and unpredictable organic gases emitted by automobiles and industrial sources

F) Synthetic Chemicals- manufacturing processes use or generate many synthetic chemicals that are powerful greenhouse gases.

Scientists use elaborate computer models of temperature, precipitation pattern and atmosphere circulation to study global warming. Many changes linked to rising temperature are already being observed. Some of the effects of global warming are as follow:• Weather • Melting of ice sheets and Glaciers • Sea Levels • Agriculture • Plants and Animals • Human Health

Hart, John. The Greenhouse effect. Chicago, 23 01 006.

"Global Warming ." Rahil, Vohn A.M. New Caribbean Geography . Caribbean Educational Publisher, 2005. 21, 63,252-3,261,258,377.

Schndider, Michael Mastrandrea and Stephen H. Global Warming: The Debate . 21 05 2009. 22 03 2013 <http://www.globalwarming.com>.