Uncharted waters: Mega cruise ships sail the Arctic

A surge in Arctic tourism is bringing ever bigger cruise ships to the region, prompting calls for a clamp-down to prevent Titanic-style accidents and the pollution of fragile eco-systems.

Greenland may be losing ice even faster than scientists thought

Assumptions in older models about how quickly the bedrock beneath melting ice rebounds now appear to be wrong. If they are, Greenland's ice has been melting about 7.5 percent faster than once believed.

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