Global Warming

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

Greenhouse 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:

  • A rise in sea level, as a result of melting of glaciers and sea-ice due to warming. It is predicted that the sea level will rise 48 cm by the end of twenty first century. 
  • The incidence of annual flooding will rise due to increased sea level.
  • Insect-borne diseases like malaria will rise.
  • It will lead to shift in climatic boundaries, making some regions wetter and others drier. 
  • Agricultural pattern would shift and human population as well as the ecosystem would experience change.