But miscalculating the cost of reducing emissions, as the world is doing, is expensive.
In the fourth quarter of 2002, AIG began its announcement with net income, but then helpfully provided an adjusted number that excluded realised losses on its securities portfolio and a large charge-off for miscalculating previous losses.
And weighing those costs and benefits today, Mr Cameron thinks that the right of his party are simply miscalculating where the balance lies.
Many believe that he walked into a trap, miscalculating that he could take South Ossetia before Russian forces arrived in strength.
One, as Mr Bush has argued, is to build limited missile defences which, if they could be made to work reliably (still far from clear), could help prevent a hostile regime bent on bother from miscalculating that a threat of a missile strike on New York or Los Angeles, or possibly London, Paris, Berlin or Tokyo, could make aggression pay.
Whatever the cause, this was a dramatic end to the dramatic life of one of the most colourful figures in modern Russian history.It was a life that Mr Berezovsky had constructed himself, scheming, calculating and miscalculating.
This life he had constructed himself, scheming, calculating and miscalculating.
"I would argue the Algerian regime is making a major blunder, miscalculating monstrously," Fawaz Gerges, an analyst at the London School of Economics, told the BBC.
But Ms Clinton may be miscalculating in South Carolina, says Brady Quirk-Garvan, the chairman of the Charleston County Democrats.
Miscalculating the number of ceiling tiles in a room at the Holiday Inn in Ipsilante, Michigan.
The governments that have recognized Kosovo "are miscalculating what they are doing," Putin said, adding, "In the end, this is a stick with two ends, and that other end will come back to knock them on the head someday".
