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Fresh snow bounces back 84 percent of the light that hits it; warm, rounded crystals can reflect as little as 70 percent. Slushy snow saturated by water – which gives it a gray cast, or even a bluish tint – reflects as little as 60 percent. Add dust or soot, and the albedo drops below 40 percent. Box's satellite data has shown a steady darkening in Greenland's albedo, from a July average of 74 percent when the century began to about 68 percent last year. And then came this summer: Without warning, the line on the albedo chart dropped deep into uncharted territory. At certain altitudes, the ice sheet in Greenland was suddenly four percent less reflective – in a single season.

But the future, pressing as it is, sometimes gives way to sheer awe at the scale of what we've already done. Simply by changing the albedo of the Greenland ice sheet, Box calculates, the island now absorbs more extra energy each summer than the U.S. consumes in a year. The shape and color of the ice sheet's crystals, in other words, are trapping more of the sun's rays than all the cars and factories and furnaces produce in the world's biggest economy. One of Box's collaborators, photographer James Balog, puts it like this: "Working in Greenland these past years has left me with a profound feeling of being in the middle of a decisive historic moment – the kind of moment, at least in geologic terms, that marks the grand tidal changes of history." Amid this summer's drama of drought, fire and record heat, the planet's destiny may have been revealed, in a single season, by the quiet metamorphosis of a silent, empty sheet of ice.

Two years ago, the Copenhagen climate summit was alive with the belief that an agreement would be reached. No such expectations have been voiced in Durban, where climate negotiations seem beset by political complacency and the prospect of failure. Yet scientists' warnings have never been clearer. Organisations such as the Royal Society, Nasa, the Met Office, the national science academies of virtually every country on the planet – as well as several dozen Nobel laureates – have made it clear they think greenhouse gases are having a major impact on the planet.

To grasp the almost suicidal state of unreality our Government has been driven into by the obsession with global warming, it is necessary to put together the two sides to an overall picture – each vividly highlighted by events of recent days

On one hand there is the utterly lamentable state of the science which underpins it all, illuminated yet again by “Climategate 2.0”,

On the other hand, we see the damage done by the political consequences of this scare, which will directly impinge, in various ways, on all our lives.

More than nine million flood victims in Pakistan face an "unimaginable catastrophe" of disease and malnutrition due to a massive shortfall in emergency funding, aid agencies have warned.

This year's flooding came as millions were still trying to recover from a similar disaster last year, described by the UN as the worst in its history. Shaheen Chughtai, a humanitarian policy adviser at Oxfam, said: "Last year it was very clear that this was an extraordinary disaster. It was a once in a century flood. The fact we have had floods again this year in Pakistan means that in terms of media news agendas it looks like a continuation of a familiar story.