Environmental scientist David Keith talks about a cheap, effective, shocking solution to climate change: What if we injected a huge cloud of ash into the atmosphere, to deflect sunlight and heat? As an emergency measure to slow a melting ice cap, it could work. Keith discusses why it’s a good idea, why it’s a terrible one — and who, despite the cost, might be tempted to use it.


  1. #1 Marc
    November 14, 2007

    He needs to look up the definition of “soluble”. Also, “adaption” isn’t a word.

  2. #2 greg laden
    November 14, 2007

    Actually, unfortunately, “adaption” is a word.