As the northern hemisphere starts to warm (rather rapidly in the USA), climate watchers' thoughts turn to melting ice, and to tell us what happened last year and what might be in store this summer, Glenn and Gareth welcome back Greenland expert Jason Box from the Byrd Polar research Centre at Ohio State University. It's a wide ranging and fascinating discussion, not to be missed. John Cook looks at the differences between sea ice in the Arctic and Antarctic, and we have news coverage of the new HadCRUT4 global temperature series, summertime in winter in the USA, worrying news about sea level from the Pliocene, a new report on climate change in the Pacific, and new developments in solar power and biofuels. Full show notes here http://www.theclimateshow.com/the-climate-show-25-box-on-ice-a-polar-specia