The globe is rocked by extreme weather and the hottest temperatures ever recorded. As global average temperatures rise, floods, droughts, unusually cold winters, forest fires and huge storms occur. Are all these horrors caused by human-induced global warming? The source of global warming is a very controversial topic. Some scientists think that global warming is a natural part of the Earth's cycle because the Earth has always had natural warming and cooling cycles. Other scientists believe that global warming is caused by humans due to the greenhouse effect. The greenhouse effect is the buildup of greenhouse gases such as carbon dioxide released by the burning of fossil fuels. These scientists believe that humans are the source and solution to the problem. Global warming, regardless of the source, is causing many negative effects on the planet, such as its impact on aquatic animals and the melting of the polar ice caps. Scientists believe that by cutting our carbon emissions through political action and finding alternative sources of energy we can stop the damage of global warming. The world today is divided into two different views regarding global warming. Although most people say that recent human activities and the use of fossil fuels cause global warming, there are also some scientists who argue otherwise. According to these scientists, global warming is not caused by humans and is just another natural cycle that the Earth has been going through since the beginning. Furthermore, it works exactly the opposite of what environmentalists say. Global warming will not be harmful and will actually benefit humanity, as it did about 1000 years ago. Global warming has become a popular policy... at the center of the card... dots®. Detroit: Greenhaven Press, 2006. Opposing Viewpoints Resource Center. Storm. Michigan State University Libraries. October 28, 2014.http://find.galegroup.com/ovrc/infomark.do?&contentSet=GSRC&type=retrieve&tabID=T010&prodId=OVRC&docId=EJ3010222254&source=gale&userGroupName=msu_main&version=1.0"HEAT SIGNALS." Science World March 6, 2011: 18 -21. Educational module. ProQuest. MSU Library, East Lansing, Michigan. October 22, 2014.http://www.proquest.com.proxy2.cl.msu.edu:2047/William D Nordhaus. “'The issue of global warming': an exchange.” The New York Review of Books 25 September 2014: 92. Research Library Core. ProQuest. MSU Library, East Lansing, Michigan. October 22, 2014.Williams, Nicole. “Al Gore's personal use of energy is his 'inconvenient truth.'” Tennessee Center for Policy Research. February 26 2007