Klaus Lackner has developed a synthetic, carbon-sucking tree. It is only conceptual, but he calculates that an area of sodium hydroxide the size of a television screen (not a 103-inch plasma behemoth but the 20-inch diagonal that people found just fine once upon a time) would soak up an amount of carbon equivalent to what one American is responsible for emitting. Or, to use another comparison, one tree could absorb about as much as 15,000 cars emit.
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