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Why the Arctic land grab is all about energy.
Jon Snow on why the treasure at the centre of the Arctic Cold Rush is energy.
"I know this is a very odd request but would you mind if I used your walk-in freezer for 24 hours or so?" - the things we have to ask to make ideas work, blogs Jane Kinney
Get the science on global warming and climate change.
The crucial issues covered from every angle.
Details and reaction to an apocalyptic climate change warning.
There's now an easier way to watch Channel 4 News when you want to.
The biggest stories and the best pictures.