【科学60秒】节能灯反成耗能元凶？_英语听力练习mp3下载-科学-沪江听力酷

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【科学60秒】节能灯反成耗能元凶？

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Engineers are always ____1____ to get better energy efficiency out of our products -- like cars that guzzle less gas or light bulbs that burn brighter on fewer watts. But even if we replaced all today's bulbs with energy-sipping LEDs, the world might not see any energy savings, according to a study in the Journal of Physics D. Because the more efficient lights get, the more light we tend to use.
The researchers looked at ____2____ since the year 1700. Even though today's compact fluorescents are 500 times more efficient than candles and whale oil lamps, what we spend on ____3____ hasn't gone down. It's just ____4____ our wealth. For the past 300 years we've consistently spent just about seven-tenths-of-one-percent of our ____5____ on artificial lighting. And the researchers think this trend could continue, because many parts of the world still haven't satisfied their appetite for light.
The upside is, more lighting means more productivity. But if the goal is green living, LEDs may not be a stand-alone solution. Instead, the authors suggest coupling those LEDs with energy policies that encourage smart lighting use. Now that's a bright idea.