An adult spirit bear crosses a fallen log over a stream in the Great Bear Rainforest in British Columbia. Barcroft Media/Barcroft Media via Getty Images hide caption

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A customer fills up at a gas station in Chillicothe, Ill., in December. Low prices have meant big savings for consumers, but urban planners worry that cheap gas will encourage sprawl. Bloomberg/Bloomberg via Getty Images hide caption

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Canada's Prime Minister Justin Trudeau welcomed Syrian refugees arriving from Beirut at the Toronto airport last week. Mark Blinch/Reuters /Landov hide caption

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Shell's Jack Pine Mine near Fort MacKay, Alberta. The largest trucks, called "heavy haulers," can hold 400 tons of oil sands material. It takes 2 tons to produce one barrel of oil. Jeff Brady/NPR hide caption

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Canada has pledged to accept 25,000 Syrian refugees, likely including women, children and injured people who have been living in camps in Turkey, Lebanon and Jordan. Here, children stand outside their tents during a sandstorm, in a refugee camp in Lebanon's Bekaa Valley in September. Bilal Hussein/AP hide caption

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Liberal Party leader Justin Trudeau gives a victory speech in Montreal, Quebec, after winning a stunning upset over Stephen Harper in Canada's federal election Monday. Chris Wattie/Reuters /Landov hide caption

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