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Go carbon free by helping reduce overall global emissions. Environmentalists agree that just one round-trip overseas flight can produce more carbon dioxide than a year's worth of car travel. Look for airlines that offer you the option of tagging a carbon offset onto your ticket. While this won't snuff out your trip's emissions, it will help balance them out. British Airways, for example, adds $16 per ton of carbon produced. They calculate the offset based on the distance flown and the type of aircraft used: A round trip from