With global access, this three-part series examines the real consequences of climate change for our civilisation, through the rest of the 21st century and beyond. Irish journalist Philip Boucher-Hayes visits climate hotspots, from Greenland's melting glaciers to sub-Saharan Africa's weather extremes, from the flooding of agricultural land in Bangladesh to the thaw of the Siberian permafrost. He meets experts and witnesses who explain the interconnectivity of the world's fragile ecology, as we reach tipping points from which there may be no return.