1. Oil
Key facts
• Worldwide, people use about 30 billion barrels of oil a year, which works out to 210 gallons per person. The worldwide total is expected to increase to 50 billion barrels a year—350 gallons per man, woman, and child—in the next few decades.
• In 2005, the United States used 28% of all the oil consumed in the world.
• In recent years, the United States consumed about 7.5 billion barrels ...
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