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سبحان الله والحمد لله ولا إله إلا الله والله أكبر ولا حول ولا قوة إلا بالله العلي العظيم , വായനയുടെ ലോകത്തേക്ക് സ്വാഗതം, അറിവിന്റെ ജാലകം നിങ്ങളെ കാത്തിരിക്കുന്നു..., "try to become a person who can appreciate the help of others, a person who knows the sufferings of others to get things done, and a person who would not put money as his only goal in life"

Apr 3, 2010

GLOBAL WARMING


Global warming is the increase in the average temperature of Earth's near-surface air and oceans since the mid-20th century and its projected continuation. Global surface temperature increased 0.74 ± 0.18 °C (1.33 ± 0.32 °F) between the start and the end of the 20th century. TheIntergovernmental Panel on Climate Change (IPCC) concludes that most of the observed temperature increase since the middle of the 20th century was very likely caused by increasing concentrations ofgreenhouse gases resulting from human activity such as fossil fuel burning and deforestation. The IPCC also concludes that variations in natural phenomena such as solar radiation and volcanic eruptions had a small cooling effect after 1950. These basic conclusions have been endorsed by more than 40 scientific societies and academies of science, including all of the national academies of science of themajor industrialized countries.


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