What is it?
Global warming is the long-term rise in the average temperature of the Earth's climate system. It is a major aspect of climate change and has been demonstrated by direct temperature measurements and by measurements of various effects of the warming.
Climate has witnessed change in the past
at the global as well as at local levels. But such a change is
imperceptible in short term. Besides the natural causes,
human activities are also important factors
responsible for global warming. The most important anthropogenic factor being a green house effect.
The greenhouse effect is a process that occurs when gases in Earth's atmosphere trap the Sun's heat. This process makes Earth much warmer than it would be without an atmosphere. It is one of the things that makes Earth a comfortable place to live.
But carbon dioxide
produced by human activities is a major greenhouse gas. Other
gases like methane, chlorofluorocarbons,
and nitrous oxideare better
absorbers of long wave radiations than carbon dioxide, and so, are more effective at
enhancing the green house effect and ultimately the Earth's temperature. This rise in temperature will
cause many other changes like: