Critics of carbon offsetting say airline passengers may be fooling themselves to think their contributions are actually making up for the CO2 they pump into the atmosphere while traveling. Although the International Civil Aviation Organization launched a standardized carbon calculator in June, even that may mask wide variances in actual travel conditions. For instance, according to one critic, a flight from London to Athens could produce 57 kilograms per person less than the ICAO standard -- or 153 kilograms more, depending on the type of aircraft flown and the load factor.

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