In March of this year, the Centers for Disease Control (CDC) reported that mesothelioma rates are on the rise. Despite a prediction that mesothelioma rates would decline after 2005, mesothelioma rates continue to rise. Between 1999 and 2015, mesothelioma rates rose from 2,479 to 2,597. A total of 45,221 individuals died of mesothelioma during that time. What is causing the rise?