As all the energy on earth come from the sun, it makes sense that solar cell and fuel cell are hot today.

我们知道，地球上所有的能源都来自太阳，这也是为什么今天太阳能电池和燃料电池受到关注的原因之一。

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But with Apple moving to install giant solar arrays and a fuel cell power station at its iDataCenter in North Carolina as part of an effort to create a coal-free iCloud, Greenpeace on Thursday issued a report that gives a slight upgrade to low marks the group previously gave the company.

FORBES: Greenpeace: How Apple Can Build A Coal-Free iCloud

"We're committed to building the world's most environmentally responsible data centers and are leading the industry in the use of renewable energy, including the nation's largest private solar arrays and non-utility fuel cell installation, " the statement said.

CNN: Apple's green image continues to be dirtied

And also hydrogen fuel cell vehicles where the hydrogen is produced by wind and solar power and also hydroelectric geothermal power.

NPR: Study Says Ethanol Pollution Could Rival Gas