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How do Human Activities Contribute to Climate Change and ...

Frequently Asked QuestionsFrequently Asked Question do Human Activities Contribute to Climate Change and How do They Compare with Natural Influences? Human Activities Contribute to Climate Change by causing changes in Earth s atmosphere in the amounts of greenhouse gas-es, aerosols (small particles), and cloudiness. The largest known contribution comes from the burning of fossil fuels, which releases carbon dioxide gas to the atmosphere. Greenhouse gases and aero-sols affect Climate by altering incoming solar radiation and out- going infrared (thermal) radiation that are part of Earth s energy balance. Changing the atmospheric abundance or properties of these gases and particles can lead to a warming or cooling of the Climate system. Since the start of the industrial era (about 1750), the overall effect of Human Activities on Climate has been a warm-ing influence. The Human impact on Climate during this era greatly exceeds that due to known changes in natural processes, such as solar changes and volcanic Gases Human Activities result in emissions of four principal green-house gases: carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O) and the halocarbons (a group of gases containing fluorine, chlorine and bromine).

IPCC,2007,climate Change,Physical Science Basis,Working Group,I,Fourth,Assessment,Report,Intergovernmental Panel on Climate Change, Human Activities, Contribute to Climate Change, Compare with Natural Influences Created Date: 8/28/2007 10:04:24 AM

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  Change, Climate, Climate change, 2007

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