德国的“千顶计划”，日本的“朝日七年计划”，美国的“百万屋顶计划”，都是有力证明。
"Thousand plans" of Germany, "the morning sun was planned in 7 years" of Japan, "plans to 1000000 roofs" of the United States, all is the strong proof.
太阳能则更加受到青睐：依据“百万太阳能屋顶”计划，加州预计在未来10内花费超过30亿美元对太阳能面板的安装给予补助。
Solar power has won even greater favor: under the "million solar roofs" scheme, the state plans to spend more than $3 billion over the next decade subsidizing the installation of solar-power panels.
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