What is emissions trading?

I need a simple explanation please

wheelwright2011-02-27T13:51:09Z

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I believe it is a means of trading or negotiating a way out of the predicament of polluters cleaning up after themselves. Economic incentives are provided in this cap and trade scheme to reduce the volume of pollutants. Under this plan , companies that exceed a certain amount of pollutants will need to buy permits. They can also sell to those that need them if there is an excess.