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13 Cards in this Set
- Front
- Back
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What protects life on earth from damaging ultraviolet radiation?
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the ozone layer
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Why does cutting down tropical rainforest contribute to global warming?
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Plants help to remove carbon dioxide from the air.
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What greenhouse gas is added to the air by cellular respiration?
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carbon dioxide
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What causes ozone holes to appear at the poles during spring?
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Chlorine atoms are RELEASED from clouds
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What treaty did not ratify the Kyoto Protocol?
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The United States
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Once in the air, how long do CFC's (chlorofluorocarbond) destroy ozone?
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for decades
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When will CFC's (chlorofluorocarbons) that are released into the air today, get into the stratosphere's ozone layer?
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10 to 20 years
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How has the average global temperature changed during the 20th century?
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risen some years, fallen some years, but has increased overall
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What are the long-term prevailing atmospheric conditions of an area?
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climate
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What change has occurred in CO2 (carbon dioxide) levels since 1958?
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Seasonal fluctutations have occurred, but overall the levels have increased.
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What did the experiments at Mauna Loa, Hawaii reveal?
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Carbon dixode concentrations have steadily increased since 1958
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What are three consequences of rising global tempertatures?
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more droughts, more major storms and a rising sea level
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What term means "the condition in which humans can survive indefinitely with their needs being met?
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sustainablility
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