Agence France-Presse: Climate change will present the greatest threat to health this century, amplifying the risk of disease, malnutrition and homelessness through floods, drought and rising sea levels, a medical panel said on Thursday. “Even the most conservative estimates are profoundly disturbing and demand action,” said the report, compiled over a year by The Lancet medical journal and experts from the Institute for Global Health at University College London. “Climate change is the biggest …