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The word "offset" means to "compensate for" or "replace" or "make up for" the carbon dioxide emitted by the planes (and all vehicles burning fossil fuels (coal, oil and natural gas)).

Air travel is a very energy-intensive activity. On average it generates about 200 grams of carbon dioxide (CO2) (7 ounces)per person, per air kilometre travelled.

Trees, too, vary in size and weight, but on average, six trees will hold one tonne of carbon dioxide, or one tree will hold 167 kilograms (368 lbs) of CO2.

A 300 km plane trip will then generate (200 x 300) 60 000g per person, or 60 kg (132 lbs) for each person, which is just over one third of a tree.

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12y ago

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