答案　D　[细节理解题。根据第二段第一句可知答案。]

　　C

　　The Japanese government has launched a campaign encouraging people to go to bed and get up extra early in order to reduce household carbon dioxide emissions(排放)．

　　The Morning Challenge campaign, unveiled by the Environment Ministry, is based on the premise that swapping late night electricity for an extra hour of morning sunlight could significantly cut the nation's carbon_footprint.

　　A typical family can reduce its carbon dioxide footprint by 85kg a year if everyone goes to bed and gets up one hour earlier, according to the campaign.

　　The amount of carbon dioxide emissions potentially saved from going to bed an hour early was the equivalent of 20% of annual emissions from household lights，“Many Japanese people waste electric power at night time, for example by watching TV until very late，”a ministry spokesperson told The Daily Telegraph.

　　“But going to bed early and getting up early can avoid wasting electrical power which causes carbon dioxide emissions. If people change their lifestyle, we can save energy and reduce emissions.”The campaign also proposes that people take advantage of an extra hour of morning sunlight by improving their lifestyles in general by running, doing yoga and eating a nutritious breakfast.

　　It is the latest initiative(倡议) fighting climate change by the Japanese environment ministry, which is faced with the challenge of reducing carbon dioxide emissions by 25% from 1990 levels within the next decade.

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