Their bill would limit greenhouse gases by requiring polluters to receive or buy emission permits, with the number of available permits - the "cap" in "cap and trade" - gradually falling over time.
他们的提案要求那些温室气体的排放者接受或购买排放许可，可获得的许可的数量将会渐渐减少，以此来限制温室气体。这就是“总量管制与交易制度”的“管制”那一环。
Their bill would limit greenhouse gases by requiring polluters to receive or buy emission permits, with the number of available permits - the "cap" in "cap and trade" - gradually falling over time.
他们的提案要求那些温室气体的排放者接受或购买排放许可，可获得的许可的数量将会渐渐减少，以此来限制温室气体。这就是“总量管制与交易制度”的“管制”那一环。
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