Many American workers, across a variety of industries, were exposed to asbestos on the job. As a result, they are now at risk to develop mesothelioma. This naturally-occurring mineral, now known to be a human carcinogen (cancer-causing agent), has a history that dates back to ancient Greece. Asbestos was used as a building material, even as far back as during the Roman Empire. Asbestos was a component of fabric that would be used in clothing and a variety of other textiles.