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Offset your carbon emmissions from flights
From TipThePlanet
A carbon offset zeros out (offsets) all or part of the carbon dioxide emissions of a party, by reducing the emissions -- or increasing the carbon dioxide absorption -- of another party. This reduces net greenhouse gas emissions with the aim of combating global warming. Effectively offsetting the emissions of an activity makes that activity "carbon neutral".
However, some controversy surrounds carbon-offset tree-planting projects, due to uncertainty about the science and accounting of sequestration coupled with criticism from community groups who have been adversely affected by certain projects.Carbon Offset Wikipedia
Also see: Carbon offsets
