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第1段
1 .This is Scientific American 60-Second Earth. I'm David Biello. Your minute begins now.
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2 .Look up in the sky! It's a bird! It's a plane!
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3 .Yes, it's a plane.
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4 .On any given day odds are you'll see several contrails, some slowly spreading out to form high, cirrus clouds.
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5 .Air travel just keeps growing and the atmosphere is starting to notice.
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6 .The act of burning kerosene and other aviation fuels to power jet engines and propellers means carbon dioxide emissions, among other types of pollution.
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7 .And that CO2, plus water vapor and the like is deposited high in the atmosphere, where it contributes most effectively to global warming.
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8 .The world's nations have spent years trying to come up with a way to restrain air travel emissions.
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9 .And this week the International Civil Aviation Organization, the ICAO, a UN body, agreed on a plan to do just that—that won't take effect until 2020.
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10 .Hence the flyby in Montreal of a chartered plane trailing the banner: "Can't Spell Procrastination without ICAO."
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11 .Solutions exist for airplane emissions, ranging from low-carbon biofuels to more efficient engines and lighter plane bodies.
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12 .If an airplane powered only by sunshine can fly across the U.S., there's reason to believe air traffic can be cleaned up, and soon.
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13 .Your minute is up, for Scientific American 60-Second Earth. I'm David Biello.
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