Global Warming Some people believe that global warming and the greenhouse effect is real and humans cause part of it. They believe this for many reasons. Carbon dioxide and other greenhouse gases, which are made by humans, have been rising, causing the earth's temperature to rise. Scientists say that there is a less then a two-percent possibility that the melting of polar ice is caused by natural climate (Woodard). Changes in cities also affect local …showed first 75 words of 730 total…

…showed last 75 words of 730 total…cause some local and global warming. Ruth A. Elben and William R. Elben, Eds. The Encyclopedia of the Environment Houghton Mifflin Company, Boston, New York  Colin Woodard The Great Melt: Is it Normal, or the Result of Global Warming? Chronicle of Higher Edu., 7/4/2000,Vol 46 Issue 45, p. A20, 2p, 1c Matthew Polesetsky, Editor Global Resources, Opposing Viewpoints Greenhaven Press, Inc. Sam Diego, CA  S. George Philander Is the Temperature Rising? Princeton University Press, Princeton, New Jersey 