Biggest Health threat worldwide? Climate Change

According to a new report by the Lancet (the world's leading general medical journal) and University College London the biggest threat to public health over the coming years is climate change which will cause mass migration, which will bring with it numerous problems.
The bbc website says;

"Climate change will exacerbate the divide between rich and poor, hitting the poorest communities first and hardest.

Population growth, primarily in least developed regions, will combine with climatic effects to cause instability of food and water supplies. That in turn will drive mass migrations and create civil unrest, they say."

Want to help now? Off set your carbon footprint. Taking a year out? Why not help build a sand dam in Kenya.