1-25 - 21:56 GEO271: StudyQuestionsfor G 1. Reduedfrostdays...

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21:56 GEO 271: Humans and Natural Resources Study Questions for 1/25/11 Global climate change impacts in the US     1. What climate related changes have been observed in the USA? Increases in air and water temp Redued frost days Increased frequency and intensity of heavy downpours Rise in sea level Reduced snow cover, glaciers, permafrost, and sea ice Longer ice-free period on lakes an rivers Lengthening of growing season Increased water vapor in the atmosphere 2. Where do projections of future climate change come from? Careful analyses of outputs from global climate models run on the world’s  most advanced computers 3. What mitigation options can be taken to reduce greenhouse gas  emissions? Option for limiting climate change by heat traping emissions such as carbon  dioxide, methane, nitrous oxide, ad halocarbons, or removing some of the  heat-trapping gases from the atmosphere 4. What is adaptation in regards to climate change? What adaptations can  be implemented to cope with climate change? Changes made to better respond to present or future climatic and other  environmental conditions, thereby reducing harm or taking advantage of  opportunity 5. Why are climate change impacts likely to persist no matter how  aggressively greenhouse gas emissions are reduced? the effects of gases that have already been released o gases are very long-lived and the levels of atmospheric heat-trapping  gases will remain elevated for hundreds of years or more.  o Second, the Earth’s vast oceans have absorbed much of the heat added  to the climate system due to the increase in heat-trapping gases, and will  retain that heat for many decades.
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o In addition, the factors that determine emissions, such as energy-supply  systems, cannot be changed overnight. 6. What makes adaptation to climate change particularly difficult? society won’t be adapting to a new steady state but rather to a rapidly moving target. Climate will be continually changing, moving at a relatively  rapid rate, outside the range to which society has adapted in the past. The  precise amounts and timing of these changes will not be known with certainty.
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