Q: OK, say the government increases the gas tax, and we all buy hybrid cars. Can we get to where we need to be through conservation alone?
"It's extremely important but, no, conservation isn't enough. The biggest reason is that energy demand is accelerating; even with conservation, it will double by the year 2050. At exactly the moment that demand for energy is surging, more and more of the world's conventional oil fields are going into decline. So supplies of oil and gas that are easy to extract will struggle to keep up with demand, which means increasing use of unconventional fossil fuels, such as oil sands, including and especially coal."