What has changed in the past one hundred years?




There is one Earth and more than seven billion people.






Atmospheric CO2 data





References

Bureau of the Census, 2000. Total Midyear Population for the World: 1950-2050. Retrieved 6 Oct 2001 from http://www.census.gov/ipc/www/worldpop.html.

Bureau of the Census, 2002. Historical Estimates of World Population. Retrieved 16 Aug 2002 from http://www.census.gov/ipc/www/worldhis.html.

Nemiroff, R. and J. Bonnell, 2001. A solar Prominence Erupts. Retrieved 6 Oct 2001 from http://antwrp.gsfc.nasa.gov/apod/ap010924.html.

Nemiroff, R. and J. Bonnell, 2001. M74: The Perfect Spiral. Retrieved 6 Oct 2001 from http://antwrp.gsfc.nasa.gov/apod/ap011004.html.

University Corporation for Atmospheric Research, 1995. Earth Photo by the Apollo 17 Crew. Retrieved 6 Oct 2001 from http://www.windows.ucar.edu/cgi-bin/tour_def/earth/images/earthafr_image.html.




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