"As long as we're consuming fossil fuels, we're putting out CO2," says Klaus Lackner, a geophysicist at Columbia University.
“只要我们还在消耗化石燃料，我们就在排放二氧化碳。”哥伦比亚大学的地球物理学家克劳斯· 拉克内说。
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Dr Lackner believes, however, that air-capture technology could have near-term, small-scale commercial USES that will enable it to pay its way as it is perfected and scaled up.
But environmentalists expect emissions-trading markets eventually to price the gas at about $50 a tonne, and Dr Lackner hopes to get the cost of his process down to $30 per tonne in the long run.