UN climate chief warns current path leads to 'catastrophe'

The U.N. climate chief says world leaders must recognize there is no option except to speed-up and scale-up action to tackle global warming, warning that continuing on the current path will lead to "a catastrophe.

New view of how ocean 'pumps' impact climate change

Earth's oceans have a remarkable natural ability to pull carbon from the atmosphere and store it deep within the ocean waters, exerting an important control on the global climate.

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