From this tiny island, they've watched the sea for 60 years. Here's what they've learned.

Researchers on Helgoland in Germany have observed temperature and sea life at the same spot offshore every workday since 1962. The data are a unique document of climate change.

Helgoland, population 1,370, lies 30 miles off the German mainland in the North Sea. A popular tourist spot, it's so small that cars are banned and bicycles heavily restricted.

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