At first glance, the snow that's changed from white to bright pink in the Italian Alps seems like a stunning feat of nature. But scientists say it may actually be a warning sign of environmental trouble. Algae are to thank — or blame — for the pink layer that currently coats the Presena Glacier in northern Italy. Scientists say it's not an uncommon phenomenon in the spring and summer, but they warn that it could become a problem if it starts occurring more frequently.
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