Level 2 - Details on Climate Change and
Global Warming

• 1. Has the climate changed during the 20th century?
  • 1.1. Has the world warmed?
  • 1.2. What other climate changes have been observed?
  • 1.3. What aspects of our climate have NOT changed?
    
    
• 2. What causes this climate change?
  
  • 2.1. Are human activities modifying the atmosphere?
  • 2.2. How well is climate change understood?
  • 2.3. To what extent is climate change due to human activities?
    
    
• 3 . What climate changes are expected for the future?
  
  • 3.1. What emission scenarios are projected?
  • 3.2. What climate changes are projected for the 21st century?
  • 3.3. What climate changes are projected for future centuries?
    
    
• 4. What are the likely consequences of climate change?
  
  • 4.1. Has climate change already started to affect us?
  • 4.2. How potentially could climate change affect us?
  • 4.3. What other major impacts could climate change possibly have?
  • 4.4. What should be done?
    
    
• 5. How could Climate Change affect us in the future?
  
  • 5.1. What would be the effects on and vulnerability of the natural systems?
  • 5.2. What would be the effects on and vulnerability of the human systems?
  • 5.3. How does climate change vulnerability vary across regions?
    
    
• 6. How could greenhouse gas emissions be reduced?
  
  • 6.1. How is Climate Change a unique problem?
  • 6.2. What are the options for reducing greenhouse gas emissions?
  • 6.3. What would be the costs of implementing the Kyoto Protocol?
  • 6.4. What are the ways and means for mitigation?
  • 6.5. What in the current knowledge needs to be improved?
    
    
• 7. Are recent extreme weather events due to global warming?
  
  • 7.1. What extreme events could global warming explain?
  • 7.2. Is the occurrence of extreme temperatures increasing?
  • 7.3. Are precipitation levels changing?
  • 7.4. Are storms affected by global warming?
    
    
• 8. Do man-made greenhouse gases matter compared to water vapor?
  
  • 8.1. How do gases affect the earth's temperature?
  • 8.2. What is the human contribution?
  • 8.3. How could water vapor amplify global warming?
  • 8.4. What is the role of clouds?
    
    
• 9. Can ecosystems adapt to Climate Change?
  
  • 9.1. Are ecosystems less adaptable now to Climate Change?
  • 9.2. Is the speed of Climate Change detrimental to ecosystems?
  • 9.3. Has man affected the adaptability of ecosystems?
  • 9.4. Which ecosystems would be the most affected?
    
    
• 10. What is and is not known with certainty about climate change?
  
  • 10.1. What's known for certain?
  • 10.2. What's likely but not certain?
  • 10.3. What are the big unknowns?
  • 10.4. Living with uncertainty
    
    
• 11. Conclusion (Level 1 only)
  
  
• 12. Other views (Level 1 only)