Frequently asked questions - From the report accepted by Working Group I of the Intergovernmental Panel on Climate Change but not approved in detail

Nov 2007

This paper contains the most frequently asked questions (FAQs) in relation to climate change. These FAQs have been taken directly from the chapters of the Fourth Assessment Report of the Intergovernmental Panel on Climate Change (IPCC).
A list of questions addressed is showed below.

  • What factors determine earth’s climate?
  • What is the relationship between climate change and weather?
  • What is the greenhouse effect?
  • How do human activities contribute to climate change and how do they compare with natural influences?
  • How are temperatures on earth changing?
  • How is precipitation changing?
  • Has there been a change in extreme events like heat waves, droughts, floods and hurricanes?
  • Is the amount of snow and ice on the earth decreasing?
  • Is sea level rising?
  • What caused the ice ages and other important climate changes before the industrial era?
  • Is the current climate change unusual compared to earlier changes in earth’s history?
  • Are the increases in atmospheric carbon dioxide and other greenhouse gases during the industrial era caused by human activities?
  • How reliable are the models used to make projections of future climate change?
  • Can individual extreme events be explained by greenhouse warming?
  • Can the warming of the 20th century be explained by natural variability?
  • Are extreme events, like heat waves, droughts or floods, expected to change as the earth’s climate changes?
  • How likely are major or abrupt climate changes, such as loss of ice sheets or changes in global ocean circulation?
  • If emissions of greenhouse gases are reduced, how quickly do their concentrations in the atmosphere decrease?
  • Do projected changes in climate vary from region to region?

By: IPCC 2007

 
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