Expanding the search for oil is necessary to pay for the damage caused by climate change, the Governor of Alaska has told the BBC.

The state is suffering significant climate impacts from rising seas forcing the relocation of remote villages. Governor Bill Walker says that coping with these changes is hugely expensive. He wants to "urgently" drill in the protected lands of the Arctic National Wilderness Refuge to fund them. Alaska has been severely hit by the dramatic drop in the price of oil over the past two years.

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COAL: The fuel associated with the industrial revolution remains a key energy staple. Hard coal production worldwide has increased by 65% over the last quarter of a century. Proven reserves are abundant and estimated to last 164 years - considerably longer than oil or gas. Coal supplies over 24% of global primary energy needs, and is the largest single source of the world's electricity (40%). However it also produces more greenhouse gas emissions for the energy it gives than any other major fuel.

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