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Readers and authors talk

• Elisabeth J. Potts on Climate collision course: CO2 levels about to hit 400 ppm »  As of this week, we have already reached the 400ppm milestone. Here's the thing: We all need some sp...
  
  
• Ed Johnson on Roundup of distressing climate news »  Thank you all for your comments and commitments. I too sense this with out all the research backgrou...
  
  
• Lee Samelson on The climate change mountaintop »  It seems like the stages occur in reverse order for climate hawks Climate hawks or climate activists...
  
  
• Steve on For sale, habitable planet, too late »  Doug, I am in a similar place to you, I think. I have probably never really faced up to the reality ...