You might want to keep some notes.  Print this page.    It will help you.

Natural Causes
 

http://www.clearlight.com/~mhieb/WVFossils/ice_ages.html http://www.geodata.soton.ac.uk/hypermail/envsci/group2/topic4/0001.html  http://news.bbc.co.uk/1/hi/sci/tech/56456.stm http://www.sciencedaily.com/releases/2002/07/020731080631.htm Sun vs Climate graph. Take a look at this graph.

Man made causes
 

http://library.thinkquest.org/26993/global.htm http://www.dreamchange.org/about/action/warming/fact.html http://www.umich.edu/%7Egs265/society/greenhouse.htm http://www.ran.org/info_center/factsheets/04a.html Carbon Dioxide Readings  Using the data from the link below, you need to construct a line graph. You will want to use the last numbers represented on the data sheet (this is the average for the year).  DO NOT graph for every year.  Every five years is sufficient.  (For example:  1960, 1965, etc.)  http://cdiac.esd.ornl.gov/ftp/ndp001/maunaloa.co2

After researching this topic extensively, you are now in a position to make your own opinions on global warming and the earth.

Natural Events	Man-Made Events