Obviously, tackling this problem will cost even more than we thought [/sarcasm]
Bingo. That's why the 'global warming' liberals have been avoiding the subject. As long as CO2 can be nade the culprit, it was possible to connect it to mankind and industry....the two biggest enemies of liberalism.
They wanted to get control over energy, and thus have control over virtually all of man's activities. That's why people like George Soros et al sunk so much money into research grants paying scientists to reach foregone conclusions about global warming and ignoring all else.
Why else would they feel the need to realease another global warming scare story every few days?