A three part article from Treehugger:
- Part 1: Greener Flying: Not All Flights are Created Equal – if you have to fly, think about more fuel efficient (newer) airplanes, as fuel efficiency has improved dramatically since the ’50s – though having a plane full of people is the best bet all around (of which you have little control). You can also find out if efficient turboprop planes are available on your route and check out Greener airlines to discover least environmentally harmful companies.
- Part 2: Greener Flying: Top 20 Most Popular Airline Routes – check out the 20 most popular airlines routes and see who offers the best and the worst options for low CO2 emissions. Also try an airline that offers economy only – more dense, more people, thus reduces carbon emissions.
- Part 3: Greener Flying: Alternatives to Flying – Or try an alternative to flying such as video or teleconferences, high speed rails, bus, rent a fuel efficient car, or purchase carbon offsets.