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A containment pond holds tar sands tailings, consisting of a mixture of sand, water, and toxic chemicals that remain after the unrefined oil products have been extracted.

图为污水池里的油砂残渣，其中混有沙子、污水以及萃取未精炼的石油产品后所残留的有毒化学物质。

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We are overfishing our oceans, polluting our water with fracking and deepwater drilling, turning to the dirtiest forms of energy on the planet, like the Alberta tar sands.

我们在海里过度捕捞、深水钻井污染水资源、转向地球上最脏的能源形式比如说：尼古丁沙子。

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Many years later, settlers used the tar,or asphalt, on the tops of their houses to keep water out.

VOA: special.2010.04.07

Tar balls and oily water were spotted on Monday near the mouth of Lake Pontchartrain, a large lake to the north of New Orleans, in Louisiana.

BBC: Gulf oil spill reaches Texas as tar balls wash ashore

Meanwhile, back in North America, new techniques were being developed to extract oil and natural gas from shale formations deep underground, from tar sands in Canada, and from deep water in the Gulf of Mexico.

WSJ: China Foothold in U.S. Energy

For the most part, the tar sands consist of quartzite, clay, and water.

NEWYORKER: Unconventional Crude