The world’s biggest glacier truck, with tyres two metres (6.5ft) tall, offers tourists breathtaking views of Langjökull, Iceland’s second-largest sheet of ice. Climate change could melt as much as 80 to 90 per cent of the glacier by the end of the century, according to Thorsteinn Thorsteinsson, a glacier specialist at the Icelandic Meteorological Office. New mountains and glacial islands have been exposed as the ice melts at a faster rate than it grows during winter months.