Measurements indicate that the global temperature has increased by about 1 degree Fahrenheit in the past century. This warming trend appeared during a period when human activities were beginning to increase the carbon dioxide (CO2) and other greenhouse gases in the atmosphere.Although most scientists believe that a rise in carbon dioxide emissions will lead to further global warming, uncertainties remain about the timing and severity of resulting climatic change. Nevertheless, many are convinced that human activities are partly responsible for the long-term warming of the past century and that climatic changes caused by greenhouse gas increases will be a continuing part of our future. They believe there is enough evidence to warrant a sensible approach toward minimizing the potential consequences of global warming.

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