9. The magnitude of the energy forcing to the Earth's climate due to greenhouse gases is about the same (with a factor of two) as that due to natural variations in the brightness of the Sun. 

• True
• 
  
• False

10

 Much less than 1%. The magnitude of the energy forcing to the Earth's climate due to greenhouse gases is about what fraction of the total energy incident on the Earth from the Sun? 

• about  1-3%  
• About 10% 
• About 25-30%

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