(Test Drive: Carbon Footprint Calculator) Some scientists believe that carbon emissions, especially from the burning of fossil fuels, contribute significantly global warming and that this can be combatted if individuals take steps to limit their use carbon-based fuels. Various organizations and individuals are increasingly concerned about their "carbon footprints." Websites such as TerraPass http://www.terrapass.com/carbon-footprint-calculator-2 / and Carbon Footprint http://www.carbonfootprint.com/calculator. aspx provide carbon footprint calculators. Test drive these calculators to determine your carbon foot- print. Exercises in later chapters will ask you to
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