I am rather amused at the notion that the meeting of a bunch of Very Important People matters firstly and secondly that anyone actually believed something substantive could be accomplished by it. It's possible that had the US Senate worked out something like a climate bill, however horribly monstrous those bills have become (for all the economic feathers ruffling over cap and trade versus carbon taxes the current bills in Congress don't even resemble cap and trade in the first place), that this meeting would have some clarity of purpose. I doubt very much it would have improved the productivity of it however.
I suppose the good news is that's it is becoming more likely that some nations will start looking more seriously at geo-engineering research the longer it takes for international arrangements to crystallize around an actual policy on carbon. To say nothing of making that arrangement stick and making it meaningful in a climate science.
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