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ozone hole |
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However, replacing them with hydrogen gas--considered to be a clean-burning source of energy--may generate a different set of environmental problems, including large and long-lasting ozone holes, according to a new analysis. Set to rollicking blues, calypso and folk melodies, and backed by a children's chorus, Vermont schoolteacher Kallis takes young listeners on a guided tour of today's issues, from recycling to acid rain and ozone holes. Mars has huge ozone holes and Venus is suffering from a runaway greenhouse effect, she said. |
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