Natural gas HCCI lean burn can achieve very low NO emission.

天然气HCCI稀薄燃烧可以得到极低的NO排放。

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Therefore by regulating swirl number of combustor NO emission caw be reduced.

因此，适当调整燃烧室的旋流数可以降低NO排放。

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In the Olympic Green, no emission or ultra-low emission vehicles will be used.

奥林匹克公园内采用零排放车辆和超低排放车辆。

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Started in 1990, the program requires carmakers to earn a certain number of credits, based on their market share, from selling low-emission and no-emission vehicles, or face penalties that can include being barred from selling in California.

FORBES: Hot Air

This will most likely entail increasing the corn ethanol mix in petroleum, running up food costs, depleting water supplies, and causing environmental land damage while affording no net CO2 emission reduction.

FORBES: Cap-and-Trade Fantasies In Disneyland

Just as Luther criticised indulgences, critics of offsetting argue that the ability to buy retrospective forgiveness for sins of emission is no substitute for not sinning in the first place.

ECONOMIST: Carbon offsets