Imagine buying a car, driving it off the lot and never checking or changing the oil, filling it up with gas, or getting regular tune ups.

想象你买一辆小车，把它开走，可是从不检查油或换油，也不加油，更不进行常规调校。

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China's voracious demand for raw materials and U.S. appetite for gas and oil are driving the economy today, along with a domestic real estate boom.

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Scientists say it's apparent that human activity -- namely burning coal, oil and natural gas -- has been driving a rapid rise of carbon dioxide levels in the atmosphere.

CNN: CO2 levels hit new peak at key observatory

The U.S. is even more dependent on Saudi oil than it was when we were driving gas-guzzlers in 1972.

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