Why won't deniers answer "Radiative Forcing" questions with a straight answer?

J

johnnyrockets16

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Why won't deniers answer "Radiative Forcing" questions with a straight answer?

Is it because there is a total net POSITIVE effect due to human activities?

http://www.ipcc.ch/pdf/assessment-report/ar4/wg1/ar4-wg1-chapter2.pdf
 
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