Earlier I noted that a lot of what Copenhagen was about was the redistribution of wealth, primarily that of America, which our Fearless Leader was only too happy to agree to, even if in a "non-binding" way. And really not so much about the actual "health" of the planet.
It seems that this "redistribution" was a motivating factor for many there.
It isn't the climate that bugs "the world," or concerns about CO2, but rather the dynamism (and, as a result, unpredictability) of capitalist economies. How easy is it to handicap a juggernaut as the American economy is, or rather, was? Simple. Convince a simpatico American leader to handicap it for you.