Walsh said the European Union should use its emissions trading scheme as a fore-runner for a global programme but not attempt to drag in non-EU airlines lest they take legal action.

沃尔什还表示欧盟应该作为全球计划的先驱，实行它的排放权交易计划，但不要尝试将非欧航空公司也拉这项计划，以免他们提出诉讼。

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If that project takes off it could become the world's largest water-quality trading programme, spanning as many as eight states and allowing trading between 46 power plants, thousands of wastewater facilities and about 230, 000 farmers.

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Well, even in these days of programme or flash trading, that is patently not true of all assets.

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In Britain, where DuPont participates in a voluntary emissions-trading programme, the government has, in effect, paid companies to accept reduction targets, he says.

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