A TED Talk, featuring physician Cheryl Holder, who says the health impacts of climate change are already here for the poor and vulnerable. Unseasonably hot temperatures, disease-carrying mosquitoes and climate gentrification are threatening those with existing health conditions, while wealthier people move to higher ground. She proposes impactful ways clinicians can protect their patients from climate-related health challenges — and calls on doctors, politicians and others to build a care system that incorporates economic and social justice.