Flying the cleanly skies?

Just a few decades from now, people may look back at the early 21st century with both fondness and horror as the Era of the Cheap Airline Flight. They may wax nostalgic for the days when visiting distant relatives and taking vacations in exotic locales were easily affordable for the masses. But they also may be alarmed at how long it took the world to realize the havoc that unfettered air travel was wreaking on the world's climate.

At least one travel industry official predicts that in 30 years, long-distance flying will be undertaken only by the wealthy as ticket prices rise dramatically – and the number of flights shrinks proportionately – to curb the emissions of greenhouse gases created by air travel.

Jet engines burn kerosene, which gives off carbon dioxide (CO2), a leading cause of global warming. Airline flights today make up less than 3 percent of man-made CO2 emissions, though they also spew nitrogen oxide, sulfur dioxide, soot, and water vapor that may double their total warming effect on the climate.

Now two factors are conspiring to make airline travel a hot topic in the global-warming debate: If current trends continue, the number of airline tickets sold per year will double to more than 9 billion by 2025, according to a new study by the Airports Council International. At the same time, experts see no viable jet-fuel alternative to kerosene. While some modest fuel-conservation measures still can be taken, more and more people are concluding that fewer flights may be the only way to cut airline emissions significantly.

In Britain, a prosperous island country that makes heavy use of air travel, CO2 emissions from flights will surpass those from automobile trips in the next six to eight years, says Alice Bows, a senior research fellow at the Tyndall Centre for Climate Change Research at the University of Manchester.

Four years ago, the British government pledged to cut greenhouse-gas emissions by 60 percent by midcentury. As the difficulty in achieving that goal has become more evident, air travel has become the whipping boy for environmentalists. Prime Minister Tony Blair was criticized for flying to Miami for a Christmas holiday, and Prince Charles was viewed as a hypocrite for boarding a jet to Philadelphia to accept an environmental award. Last summer, the Bishop of London, Richard Chartres, called taking a vacation by airline "a symptom of sin" in which "people ignore the consequences of their actions." The bishop vowed he would not board an airplane in 2007.

Asking the British people to cut down on air travel is impractical, Mr. Blair says. But the government has just upped a tax on airline flights from £10 to £40 ($19 to $76), depending on the length of the flight, in the name of reducing air travel and CO2 emissions.

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