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Purchase carbon offsets

When you buy offsets, it counterbalances your travel pollution by funding an emission-reducing effort elsewhere. Groups such as Carbonfund, Green Mountain Energy and TerraPass use carbon-offsets money to fund clean-energy initiatives, such as wind-power projects and capturing landfill gases.

Certain airlines, including United Airlines and Jetstar, offer carbon-offset purchases during booking. 

Learn more: Here's a week's worth of environmentally friendly practices to inspire you all year.