Flying creates tons of CO2 each year (find out how much for each flight) and now many of the major online ticket sites are offering offsets when you buy.

All of the most prominent online travel agencies — Expedia, Orbitz and Travelocity — offer a convenient way to voluntarily pay to offset CO2emissions caused by a trip. Just click to have the price of the offset added to your bill.

Each online travel agency contracts with one of several clean energy companies (Expedia – TerraPass, Orbitz – Carbonfund, Travelocity – The Conservation Fund).

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