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A car that travels 15,000 miles a year and averages 25 miles per gallon exhales about 5.5 metric tons of C[O.sub.2].Anyone feeling a twinge of guilt over that might be interested in buying carbon dioxide credits, a novel way to offset your C[O.sub.2] trail.
Carbon credits give the buyer the right to release atmospheric C[O.sub.2], a prime contributor to global climate change. They're basically a tax on C[O.sub.2] that's used to help develop cleaner technologies. The Kyoto Protocol, an international treaty designed to limit global warming, spawned a worldwide market in carbon credits. Now you can get in on it.
How it works. In the U.S., a trading system for big players is operated by the Chicago Climate Exchange. If member companies can prove they've cut emissions below a cap set by the exchange, they can trade or sell the difference as "credits." Polluters that can't meet caps buy credits to balance their carbon budget. Other parties can buy credits, too-to remove them from ...