Climate change is the single biggest health threat facing humanity, states the World Health Organisation. Between 2030 and 2050, climate change is expected to cause approximately 2.5 lakh additional deaths per year, from malnutrition, malaria, diarrhoea and heat stress. Ahead of World Health Day, NDTV-Dettol Banega Swasth India interacted with Dia Mirza to discuss the link between the health of the planet and health of the humans. Ms Mirza is an actor, eco-investor, UN Environment Goodwill Ambassador, and UN-Secretary General's Advocate for Sustainable Development Goals (SDGs). Here are some excerpts from the interview.