Climate change is making more than half of human pathogenic diseases even worse, according to a study published in the journal Nature. More than 200 known infectious diseases have been at some point aggravated by climate-related events like heat waves, rising sea levels, and wildfires. Dr. William Schaffner, professor of preventative medicine at the department of health policy and professor of medicine for the division of infectious diseases at Vanderbilt University Medical Center, joined Cheddar News to break the study down.