What folks seem to ignore is the enormous amount of the earth that is currently a hellscape because its so cold.

FORBES: Krugman on Being Dovish: Social Security and Climate Editions

"In wintertime, the cliff surface gets so cold that its temperature falls below the freezing point of CO2, which at low pressure goes directly to solid, " said Dr Musselwhite.

BBC: Doubts over water on Mars

Its new alignments, no longer so wedded to cold-war geography, will probably be more effective.

ECONOMIST: Patrolling the world | The