Simply stated, there's big money in it.
Read "Global Warming Dogma and the New Iron Triangle."
What is that "iron triangle"? Scientists, environmental organizations, and subsidized industries (think Solyndra and a hundred other "private" companies that are totally dependent on government largesse for their existence).
The global warming movement. One that long ago moved out of the realm of science and entered that of greed.
Question: How long can it go on?
Answer: As long as the cash keeps pouring in.