By one estimate, 250, 000 British children attend summer camps each year.

ECONOMIST: An American tradition is spreading

"This suggests that current model projections may in fact provide a conservative estimate of future Arctic change, and that the summer Arctic sea ice may disappear considerably earlier than IPCC projections, " said NSIDC's Julienne Stroeve who led the study.

CNN: Arctic melt worse than predictions

Because crude demand peaks during the summer season in the Northern Hemisphere, we estimate that preventing further market tightening in the third quarter will require 2 million barrels per day of additional supply.

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The Members' Estimate Committee, chaired by Mr Martin, is due to report back by the summer with its suggestions to overhaul the expenses system used by MPs.

BBC: Speaker facing expenses inquiry

They also look very similar to the simulations coming out of Piomas (Pan-Arctic Ice-Ocean Modelling and Assimilation System), an influential computer model that has been used to estimate Arctic sea-ice volume and which has been the basis for several predictions about when summer sea ice might disappear completely.

BBC: Cryosat spots Arctic sea-ice loss in autumn