Taking Earth's temperature

The US National Oceanic and Atmospheric Administration (NOAA) announced that June 2014 was the hottest since records began. The average global temperature was 16.2C, 0.7C higher than the 20th-Century average and one-twentieth of a degree higher than the previous warmest June in 2010. May was also a record breaker. Tim Naish is at the Antarctic Research Centre at Victoria University in Wellington where he's looking at the effects of these high temperatures on the Antarctic ice sheet, as he explains to Chris Smith and Simon Morton...