
STEVE RINGMAN / THE SEATTLE TIMES
Canada's oil-sands boom creates vast riches and a dirty footprint
A shop mechanic walks past one of the huge tires on a Caterpillar dump truck. The tires cost $60,000 apiece.

STEVE RINGMAN / THE SEATTLE TIMES
A shop mechanic walks past one of the huge tires on a Caterpillar dump truck. The tires cost $60,000 apiece.
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