Climate change is "single biggest health threat facing humanity," WHO says

A new report released by the World Health Organization on Monday warns that climate change is the "single biggest health threat facing humanity."

The report points out that climate change is already impacting the lives and health of millions of people in various ways, and that while "no one is safe from these risks," people in low-income communities are most vulnerable.

The threats include harm or death from increasingly frequent extreme weather events such as heat waves, storms and floods, as well as the disruption of food systems, the spread of diseases from animal populations, food- and water-borne illnesses, related mental health issues and more.