Global Warming

Global warming is a term used to describe the increase over time in the earth’s average temperatures as a result of what are now commonly known as ‘greenhouse gases’ (such as carbon dioxide and methane). These gases cause pollution that builds up in the earth’s lower atmosphere and prevents heat escaping into space. Scientists predict that global average temperatures will rise by between 1.8 and 4.0 degrees Celsius this century.

This article is found from

http://www.greenpower.gov.au/about-the-environmental-challenge.aspx