"In the face of an absolutely unprecedented emergency, society has no choice but to take dramatic action to avert a collapse of civilization" Blue Planet Laureate’s UN Rio+20 statement Feb 2012. "Climate change is the biggest global health threat of the 21st century. Its impacts will be felt by most populations in the next few decades and it will put the lives and livelihoods of billions of people at increased risk." (Managing the Health Effects of Climate change, University College London 2009)