One of the Eight Wonders of the World could be a strong indicator of human impact on the environment.

Sculpted in 208 BC and preserved in underground fortresses, the Terra Cotta army of the Qin Dynasty is still standing more than 2,200 years later. But it is air pollution, the army's new age enemy, that could cause these life-size warriors to crumble and fall.

For the past 6 years, Dr. Judith Chow and team of experts have been trying to develop ways to sustain these hand crafted relicts for years to come. "We don't know how long they will last for the future," says Dr. Chow.

Without quality preservation and controls now, these ancient clay men won't stand a chance in the future battles against air pollution.

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