BBC: Human societies will soon start to experience adverse effects from manmade climate change, a prominent economist has warned.
Prof Richard Tol predicts the downsides of warming will outweigh the advantages with a global warming of 1.1C - which has nearly been reached already.
Prof Tol is regarded by many campaigners as a climate "sceptic".
He has previously highlighted the positive effects of CO2 in fertilising crops and forests.
His work is widely cited by climate contrarians.
"Most...