Scientists are concerned about the melting of "Permafrost" in Arctic regions. Why is this considered a 'climate tipping point'?

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A It will provide more liquid water for people to drink.
B It releases trapped methane, a greenhouse gas much more potent than carbon dioxide.
C It allows for easier shipping routes across the North Pole.
D It helps polar bears find more land to live on.

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Scientists are concerned about the melting of "Permafrost" in Arctic regions. Why is this considered a 'climate tipping point'?

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