Paul Hanlon, the science editor of Britain’s Daily Mail has been possibly the UK’s most influential climate sceptic. Following a trip to Greenland he writes: "Yes, global warming is real – and deeply worrying".

His article continues "I have long been something of a climate-change sceptic, but my views in recent years have shifted. For me, the most convincing evidence that something worrying is going on lies right here in the Arctic. "

"Greenland is silent, almost. There is no wind, no birds, no insects; apart from the scientists around me the world of Man is far away. But there is sound, which you have to strain your ears to hear. A gurgling sound, the tinkle-trickle of drains, and a deeper, Hadean roar – the noise of an icecap liquefying."

"Sceptics will argue that Greenland has always had moulins and meltwater rivers; this is true. But what is new is these used to be confined to the very edge of the icesheet, marginal, ephemeral features that lasted just a few weeks in the height of the summer melting season. Now there are lakes and moulins right on the centre of the cap, and persisting well into August."

In the United States, CNN meteorologist Chad Myers, has been regarded as one of America’s most influential global warming sceptics. Following the Russian heatwave and a giant iceberg breaking off Greenland, he commented "Is it caused by man – yes … A significant portion of this is caused by greenhouse gases keeping heat on the shore, on the land, in the atmosphere that could have escaped without those greenhouse gases".

(Also see Leading Climate Change Sceptic Changes Tack)