Traveling by air? Planes not only emit tremendous amounts of CO2, they also create contrails – the white streaks which resemble clouds – which trap heat in the atmosphere. The best solution is simply to fly as seldom as possible. If you cannot avoid air travel entirely, try to choose flights which are direct (take off and landing consume the most fuel), long distance (over 600 miles), during the day rather than at night (contrails produced at night create more warming) and use a newer, more fuel-efficient plane (an Airbus A340 or A380 or a Boeing B787). For shorter distances take the train. It’s fun and the most ecological mode of transportation over long distances.

Source: The Live Earth Global Warming Survival Handbook by David De Rothschild