The Paris summit will be missing one of the great world leaders on climate | Bill McKibben

As heads of state arrive in Paris, the Maldives' Mohamed Nasheed is being held in a prison cell. Paris will feel the absence of one of the only true world leaders on climate change

World "leaders" have been arriving in Paris by the scores over the weekend - there will be more than a hundred prime ministers and presidents making speeches as the climate talks open on Monday.

But most of them won't, in fact, be leaders on climate. And one who truly is - Mohamed Nasheed of the Maldives - will be languishing in a cell on a prison island in his nation, instead of pressing the case for carbon cuts.