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At the begginning of 2013, hydrulic fracking was introduced commercailly in the United States and Canada for pumping oil out of oil shales.
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The state of Nebraska passes a bill for the proposed Keystone Pipeline through its state.
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An environmental report is released on keystone pipeline.
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The house votes in favor of Keystone Pipline 266-153
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The senate passes the bill with a vote of 62-36.
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The House passes the bill with a vote of 270-152.
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President Obama vetos the proposed pipeline.