Saturday, March 5, 2011

nature, habitat - global warming




The increase in the average temperature of Earth’s near-surface air and oceans is known is global warming.

Over the last 50 years, almost 100% of the observed temperature increase has been due to the increase in the atmosphere of greenhouse gas concentrations such as water vapour, carbon dioxide, methane and ozone. Greenhouse gases are gases that contribute to the greenhouse effect. The burning of fossil fuels that leads to the emission of carbon dioxide is the largest contributing source of greenhouse gases.

The effects of global warming are the increase of temperature on earth by about 3 to 5 degree Celsius by the year 2100. The sea levels will also rise bt at least 25 metres by then.

Source: http://en.wikipedia.org/wiki/Global_warming
             http://timeforchange.org/cause-and-effect-for-global-warming
             http://haildubyus.com/wp-content/uploads/2008/09/2006-02-21-global_warming_polar_bear.jpg

- Xinmin

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