It is the most effective solar energy conversion process on Earth and all power needs for a year could be met by the energy contained in the sunlight hitting the Earth in one hour.

这是地球上最有效的太阳能转化过程，如果将太阳光照射地球表面一个小时产生的所有能量聚积起来，就足以满足人类整整一年的能源需求。

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Earth Hour started in 2007 in Sydney, Australia when 2.2 million individuals and more than 2, 000 businesses turned their lights off for one hour to take a stand against climate change.

“地球一小时”活动首次于2007年3月31日晚间8：30在澳大利亚悉尼市展开，当晚，悉尼约有超过220万户的家庭和企业关闭灯源和电器一小时。

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The lights will stay off for one hour for an event called Earth Hour.

VOA: special.2010.03.22

Let the fighting men stop fighting this in human Earth for one hour, and he will learn how much security there is.

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"Countries could just accommodate the divergence by not putting their clocks forward in the spring, so you'd change your time zone by one hour to bring civil time back into line with the Earth's rotation, " added Dr Whibberley.

BBC: Changes to the world's time scale debated

For hour upon hour I tramped in splendid isolation - and this in one of the most densely populated regions on Earth.

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