Thesis Statement: Climate change is caused by nature itself.
Internet: Solar variations is said to be one of the most common cause of climate change.
Time: 1 minute
Wikipedia, the free Encyclopedia. Climate change[ONLINE]. 12 Nov 2008. http://en.wikipedia.org/wiki/Climate_change
Library: The climate is affected by the sunspot activities occuring in the sun.
Time: 5 minutes.
Bahr, Lauren S., Bernard Johnston, Climate[LIBRARY], Collier’s Encyclopedia, 12 Nov 2008.