Environmental News Network: Three kinds of whale, six varieties of seal, the walrus and the polar bear all have these five things in common: they are marine mammals; they depend on the Arctic for their survival as species; they are vulnerable; and biologists know surprisingly little about them.
And since the Arctic is warming twice as fast as the rest of the planet, their future could become even more threatened as climate change increases habitat loss.
The stress, so far, is on the word 'could', as the first challenge...