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Friday, August 01, 2014 
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Concept of Climate Change
Weather is the state of the atmosphere at a specific time and place. For instance, how much sunlight and rainfall it gets, how windy it is, and so on. Climate is the pattern of weather or the average weather taken over a long time period for a given place or region. Climate change is the long-term alteration in the average weather conditions for a particular location.
Climate Change does not n e c e s s a r i l y me a n t h a t everything around us will get hotter. Instead, there will be more erratic & extreme weather conditions, which will result in heavier rainfall, more snow in some places, longer periods of drought, more storms and hurricanes, and more frequent heat waves.
The world's weather is entirely controlled by the Sun. The Earth rotates on a tilted axis. As a result, all parts of the planet do not get equal amount of heat. Different parts of our planet are heated by different amounts of Sun's energy at different times of year, making some regions hotter than others and causing the seasonal changes. The temperature variations between one part of the world and another gives rise to differences in air pressure, thereby producing winds and storms The Sun's heat also warms up the seas unevenly, driving ocean currents from one place to another.

Scientists believe that greater amounts of carbon dioxide and other greenhouse gases in the atmosphere and hotter temperatures on Earth will significantly change the climate across the whole planet. Therefore, climate change refers to any significant change in the climate (temperature, rainfall, or wind) that lasts for an extended period of time. Climate change may result from:

• Natural factors such as changes in the sun's intensity or slow changes in the Earth's orbit around the sun;

• Natural processes within the climate system (e.g. changes in ocean circulation);

• Human activities that change the composition of gases in the atmosphere such as burning of fossil fuels, deforestation, industrialization, etc.

Courtesy : World Wildlife Fund - India