A picture that went viral last month that appeared to show dogs running on water raised alarm bells about the acceleration of ice melt in Greenland. Now scientists have released a video.
Danish climatoligist Steffen M. Olsen captured this photo of his dog sled apparently travelling on water last week, as temperatures rose 40 degrees Fahrenheit above average.
Our interview with outdoor image makers Ulrika Larsson and Lukasz Warzecha.
Centuries-old Greenland icebergs in the heart of London raise awareness of climate change.