Why flight turbulence is getting worse?

Flying remains the safest form of transport. But recent incidents of extreme turbulence have once again put air travel in the spotlight. So what’s going on and why is turbulence likely to get worse? Guests: Shem Malmquist Boeing 777 Captain and instructor at the Florida Institute of Technology Paul Williams Professor of Atmospheric Science at the University of Reading Marina Efthymiou Professor of Aviation Management at DCU Business School Simon Calder Travel Journalist