Standing on North America's most visited glacier in summer, you can hear the sound of climate changing. Gurgles and babbles build to a crescendo where water cascades down holes in the ice. The Mendenhall glacier in south-east Alaska is melting and it's raising a ruckus about it. Situated in the backyard of Juneau, the state's capital city, the Mendenhall attracts more than 300,000 visitors per year, making it one of the most watched glaciers in the world. It's also become a poster child for global warming. Before the public's eyes, the glacier is shrinking. Last summer, its end point retreated up the valley by 100 metres, freeing land that had been locked under ice for centuries. Since the 1930s, the. Menden-hall has lost nearly a kilometre of its length.
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