TMGT 1P91 Lecture : TREN Lecture -Tourism in an Era of Global Change

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Nitrogen 78%, oxygen 21%, other gases 1% Cfc-11 and cfc-12, refrigerants which are non-reactive and non-toxic. This means they persist in the atmosphere. Uv rays fragment cfc gas into chlorine atoms which destroy ozone molecules. Atmosphere is the thin layer of gases surrounding earth. Most ozone o3 is located in the stratosphere. Ozone absorbs and scatters uv radiation ** It protects all life from tissue damage (genetic mutation) 70% of radiation is absorbed by the plant s surface and the atmosphere. Land and water absorb heat, making the earth s surface warmer than higher altitudes. Weather: atmospheric conditions over short periods of time and space. Climate: atmospheric conditions across large areas and over long periods of time. The atmosphere contains ghgs which absorb heat, and warm the atmosphere. Without the greenhouse effect, we would freeze. As ghgs accumulate, they increase radiation reflected back to the surface. The greenhouse effect (warming of the atmosphere, chiefly co2)

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