A group of health experts from around the world is issuing a dire warning about the climate crisis, saying that climate change is the greatest global health threat facing the world this century and is set to become the 'defining narrative of human health.' The Lancet medical journal stated that warning in its annual report, along with a policy brief for the United States detailing actions the country can take to stop millions of unnecessary deaths. Director of Climate for Health at EcoAmerica Rebecca Rehr joined Cheddar Climate to discuss.