Global warming

                         Global  warming 

Global warming is the rapid increase in earth's average surface temperature over the past contury primarily due to the  greenhouse gases released as people burn fossil fuels.

The global average surface Temperature rose 0.6 to 0.9 degree Celsius (1.1to 1.6) between 1906 and 2005 and the rate of temperature increasing has nearly doubled in last 50 years. Temperature are certain to go up further. Despite ups and downs from year to year. Global Global average surface temperature is rising. By the beginning of the 21st century earth's temperature was roughly 0.5 degree Celsius above the long term (1951-1980) average

 (NASA figure adapted from godd institure of space studies surface temperature analysis.