Google的数据中心借鉴美国电网的教训——美国电网50%的能源依赖煤炭。

Google's data centers draw from a U.S. electricity grid that relies on coal for 50% of its power.

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苹果数据中心依赖的煤炭能源占比在54.5%，紧接着是Facebook占53.2%，IBM占51.6%，惠普占49.4%还有Twitter占42.5%。

Apple's data centers' dependence on coal is estimated to be at 54.5%, followed by Facebook at 53.2%, IBM at 51.6%, HP at 49.4%, and Twitter at 42.5%.

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这个比分是将数据中心清洁能源能耗（如太阳能和风能）与非清洁能源能耗（如煤炭和原子能）相比。

The score considers the percentage of these data centers' electricity generated by "clean" energy such as solar or wind power versus "dirtier" energy sources, such as coal and nuclear power.

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