At 7.30pm on March 31, 2007, Sydney's electricity went out for an hour to remind the world that global warming is a reality and everyone should do something about it. "An Inconvenient Truth,&
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Solar energy pumps (also known as photovoltaic pumps) are the most attractive way of water supply in sunny areas in the world, especially in remote areas where there is no electricity or electricity.
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Peak carbon dioxide emission is the point at which carbon dioxide emissions stop growing and peak, and then gradually fall back. China has promised that carbon dioxide emissions will plateau until 203
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