This is a guest post by Gail the Actuary.

1. I love my SUV. Why can't we continue to use oil and gas as in the past?

George W. Bush has given us one reason why we need to make changes - Unstable foreign oil supply. Al Gore has given us another reason - Climate change.

There is a third reason that trumps the first two - WE DON'T REALLY HAVE A CHOICE. Demand for both oil and natural gas continues to rise each year, as the result of China, India and other countries wanting to adopt a lifestyle more like that in the United States. As we saw in Oil Quiz - Test Your Knowledge, world oil supply is likely to decline in the near future. With demand increasing and supply decreasing, there is certain to be a significant gap in the not too distant future.

Natural gas is similar. Like oil, we started with a finite quantity of it, and it is now depleting. The main difference is that we are dealing primarily with a gap between North American supply and demand, rather than world supply and demand, because natural gas is difficult to transport. Demand is rising, because natural gas is viewed as a less-polluting source of energy.

Natural gas supply is likely to decline in the next few years, because most of the larger, more productive sites have already been tapped. New natural gas wells are getting smaller and smaller, so that more and more new wells need to come on line each year, just to stay even. For a while, we were able to make up our shortfall with imports from Canada, but these have begun to decline. In the next few years, both US production and imports from Canada will be declining. It is doubtful that liquified natural gas imports from overseas will be able to fill the gap.

(7 more questions and answers under the fold...along with a study guide! Go Gail Go!)