Get ready for another economic shock of major proportions — a virtual doubling of prices at the gas pump to as much as $10 a gallon.

That’s the message from a couple of analytical energy industry trackers, both of whom, based on the surging oil prices, see considerably more pain at the pump than most drivers realize.

Gasoline nationally is in an accelerated upswing, having jumped to $3.58 a gallon from $3.50 in just the past week.

As many as one billion people could lose their homes by 2050 because of the devastating impact of global warming, scientists and political leaders will be warned today.

They will hear that the steady rise in temperatures across the planet could trigger mass migration on unprecedented levels.

Hundreds of millions could be forced to go on the move because of water shortages and crop failures in most of Africa, as well as in central and southern Asia and South America, the conference in London will be told.

You know when climate change is biting hard when instead of a vast expanse of snow the North Pole is a vast expanse of water. This year, for the first time, Arctic scientists are preparing for that possibility.

“The set-up for this summer is disturbing,” says Mark Serreze, of the US National Snow and Ice Data Center (NSIDC). A number of factors have this year led to most of the Arctic ice being thin and vulnerable as it enters its summer melting season.

In September 2007, Arctic sea ice reached a record low, opening up the fabled North-West passage that runs from Greenland to Alaska.

“Don’t look now, but the good times may have just stopped rolling,” the economist Paul Krugman wrote in his New York Times column. The Economist was more strident: “The era of cheap food is over,” it declared. World Bank President Robert Zoellick, reaching back to policies created during the Great Depression for inspiration to address food inflation, is pushing a “New Deal” for global food policy, aimed at aiding impoverished countries with income support and help in producing crops.

I don’t want to alarm anybody, but maybe it’s time for Americans to start stockpiling food.

No, this is not a drill.

You’ve seen the TV footage of food riots in parts of the developing world. Yes, they’re a long way away from the U.S. But most foodstuffs operate in a global market. When the cost of wheat soars in Asia, it will do the same here.