Supporters of nuclear power say reactors provide reliable, zero-carbon-emission energy the country needs to avoid dependency on natural gas.

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Although George Bush now argues that America needs to wean itself off its dependency on oil, his administration still refuses to take serious action.

ECONOMIST: Climate change

Google clearly needs to reinvent itself to reduce its advertising dependency.

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The last index we compute is donor dependency, which tries to measure how badly a charity needs your contribution--as opposed to money raised from selling products or tickets or reaping investment gains--to fund its current operations.

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