UN reports unprecedented build-up of greenhouse gases

The World Meteorological Organisation says greenhouse gas levels are higher than ever before. So what are the explanations – and why are natural carbon sinks in trouble?Also in the programme: the opposition in Georgia calls for mass protests after the Georgian Dream Party is declared winner of the election; and has a new miniature masterpiece by Chopin been discovered? We hear from the curator who unearthed the piece.(IMAGE: Aerial view of a lignite burning power station in North Rhine Westphalia - Germany. Chimneys and cooling towers releasing smoke and steam into the atmosphere. The power plant is also releasing the greenhouse gas CO2 / CREDIT: Schroptschop / Getty Images Creative)