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Narwhal tusks show mercury spike in the Arctic

Just like rings in a tree trunk, a narwhal's tusks offer clues to climate change. A new study of tusks show a sharp rise in mercury in the Arctic.
Meet the charismatic Canadian creatures that star in Our Planet
thenarwhal.ca

Meet the charismatic Canadian creatures that star in Our Planet

We go behind the scenes of the stunning footage in this blockbuster Netflix documentary series to learn more about the threats to narwhals and caribou.

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