Great unknowns: nine top scientists on the one mystery on Earth they'd like to solve

What are the greatest secrets that remain about life on our planet - and how might they affect our future? We asked the experts to pick one burning questionFrom the depths of the Amazon rainforest to the deserts of Antarctica, huge questions remain unanswered about life on Earth. We asked leading scientists and conservationists: what is the one thing you would like to know about the planet that remains a mystery?*** Continue reading...