Jack is pretty close, but is missing the point somewhat.
If he read the CNN.com on Dec. 17 he'd know that we are witnessing the rise of the virtual economy where many people already work from home or nearby in small offices. They no longer commute. The numbers are predicted to climb as boomers retire over the next 20 years, which could mean a drop in gas consumption.
I just wrote about the impact of the virtual economy on fuel consumption and traffic (read global warming) for Forbes.com last week. You can find the piece in the entry below.
It's hard to know why so few people in the media get what is happening. Perhaps it's because they still work 9-to-5?
Thoughts are welcome!