what is global warning and what are the causes?

Global warming is the increase in the average temperature of the Earth's near-surface air and the oceans since the mid-twentieth century and its projected continuation

1- Global surface temperature increased 0.74 ± 0.18 °C (1.33 ± 0.32 °F) during the 100 years ending in 2005.[

2-responsible for most of the observed temperature increase since the middle of the twentieth century,


3-Factories and a major cause of environmental pollution.

The first and foremost reason for global warming is a human.He has just become money minded and for his small profits he has been simply destroyed the gifted nature.This has ultimately given rise to a major problem-GLOBAL WARMING!!! The increased use of automobiles,ACs,refrigerators emit gases that contribute in global warming.

http://en.wikipedia.org/wiki/Global_warming