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Hanging in the front window are the rings the width of oil barrels. On each, figures spell out the surprising amount of oil needed to produce various materials. Here, one gallon of oil yields only 3.33 cubic feet of lumber.

Hanging in the front window are the rings the width of oil barrels. On each, figures spell out the surprising amount of oil needed to produce various materials. Here, one gallon of oil yields only 3.33 cubic feet of lumber.

Hanging in the front window are the rings the width of oil barrels. On each, figures spell out the surprising amount of oil needed to produce various materials. Here, one gallon of oil yields only 3.33 cubic feet of lumber.

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