60秒科学:仅仅使用节能灯还不能保证绿色生活
Engineers are always plugging away to get better energy efficiency out of our products -- like cars that guzzle 1 less gas or light bulbs that burn brighter on fewer watts 2. But even if we replaced all today's bulbs with energy-sipping LEDs, the world might not see any energy savings 3, 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 light consumption 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 overall lighting 4 hasn't gone down. It's just increased proportionately to our wealth. For the past 300 years we've consistently spent just about seven-tenths-of-one-percent of our gross domestic product 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.
- Melissa had guzzled gin and tonics like they were lemonade.梅利莎像喝柠檬汽水一样大口地喝着加奎宁水的杜松子酒。
- Pigs guzzle their food.猪总是狼吞虎咽地吃东西。
- My lamp uses 60 watts; my toaster uses 600 watts. 我的灯用60瓦，我的烤面包器用600瓦。
- My lamp uses 40 watts. 我的灯40瓦。
- I can't afford the vacation,for it would eat up my savings.我度不起假，那样会把我的积蓄用光的。
- By this time he had used up all his savings.到这时，他的存款已全部用完。