[C ] During World War II the U.S. made daylight saving time mandatory^ 强制的)for the whole country, as a way to save wartime resources. Between February 9, 1942, and September 30, 1945, the government took it a step further. During this period daylight saving time was observed year-round, essentially making it the new standard time, if only for a few years. Many years later, the Energy Policy Act of 2005 was enacted, mandating a controversial month-long extension of daylight saving time, starting in 2007.
Daylight Saving Time: Energy Saver or Just Time Suck?
[D ] In recent years several studies have suggested that daylight saving time doesnt actually save energyand might even result in a net loss. Environmental economist Hendrik Wolff, of the University of Washington, co-authored a paper that studied Australian power-use data when parts of the country extended daylight saving time for the 2000 Sydney Olympics and others did not. The researchers found that the practice reduced lighting and electricity consumption in the evening but increased energy use in the now dark morningswiping out the evening gains. Thats because the extra hour that daylight saving time adds in the evening is a hotter hour. So if people get home an hour earlier in a warmer house, they turn on their air conditioning, the University of Washingtons Wolff said.
[ E] But other studies do show energy gains. In an October 2008 daylight saving time report to Congress, mandated by the same 2005 energy act that extended daylight saving time, the U.S. Department of Energy asserted that springing forward does save energy. Extended daylight saving time saved 1.3 terawatt hours of electricity. That figure suggests that daylight saving time reduces annual U.S. electricity consumption by 0.03 percent and overall energy consumption by 0.02 percent. While those percentages seem small, they could represent significant savings because of the nations enormous total energy use.
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