Global warming means raising the temperature of the earth due to green house effect. The earth temperature rises due to green house gases trap light and heat from the sun in the earth’s atmosphere. The green house gases are carbon dioxide, methane, nitrous oxide and water vapor.

The causes for global warming are emission of carbon dioxide, methane, and nitrous oxide emissions. The large amount of carbon dioxide produced from the power plants for the generation of electricity. Another major cause for global worming is deforestation, cutting trees and burning of forests for the purpose of residence and industrialization. Depletion of the Ozone layer results in Ultra Violet radiation. The increase of UV rays causing the global warming.

The effects of global warming are spreading of diseases, warmer water, increased probability and intensity of droughts and heat waves, and economic consequences.
In 2009 the world leaders from number of countries meet for the last time in Copenhagen conference. In that conference the parties were discussed about how to prevent global warming and climate changes. In that conference a deal was agreed between the US and China, India, Brazil, and South Africa to keeping temperature rises to no more than 2C and requirements for finance to help poor countries fight global warming.