At least two broad trends are important to keep in mind. First, while renewable energy sources, such as solar and wind power, receive a great deal of attention, they will remain minor contributors to our overall energy mix. Nearly all our energy is derived from fossil fuels, whether petroleum, natural gas, or coal, and that will remain true for at least the next few decades. Second, demand for energy will continue to grow, keeping prices high. Although industrial energy consumption fell in 2009 as a result of the worldwide recession, by 2017 or so the industrial sector will consume more energy than all other users combined. That will not change for decades to come.
Although Americans are only 4% of the world's population, they consume 25% of its resources and produce 25% of its unsustainable pollution. The US has 865 foreign bases and a military and CIA presence in every corner of the globe. The country enjoys such a privileged position, this author writes, because it has made itself an imperial power. But the United States' ability to afford the cost of maintaining its empire is waning. Sooner or later, the deficit will force Washington to limit its imperial overstretch and bring its troops home.