No discussion of "green" aviation would be complete without a mention of carbon offsets-a financial Instrument aimed at the reduction of greenhouse gas emissions. Setting aside carbon offsets purchased by companies and governments to comply with caps on the total amount of carbon dioxide they are allowed to emit, we're left with the voluntary market-in which individuals, companies, or governments purchase carbon offsets to mitigate greenhouse gas emissions from such things as transportation and electricity use (see "Carbon Offsets and Calculators," page 69).
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