There are a variety of companies and charities that offer carbon offsets. Air travel generates Carbon Dioxide, which contributes to global warming. Offsetting schemes calculate how much CO2 your travel has generated, and remove the equivalent amount of Carbon Dioxide from the atmosphere. Carbon offsets are generally not expensive and are regarded by many as a good way to make your travel more ethical.
climatecare.org
co2balance.com
carbon-clear.com
