National Public Radio: A consortium of Northeast states has completed the first cap-and-trade greenhouse gas auction in the U.S. Under cap-and-trade, limits are set on emissions. Companies that do not use up their quota of emissions are able to sell their excess emission capacity to other companies. The organization responsible for this grouping of states is the Regional Greenhouse Gas Initiative. Peter Iwanowicz, chair of the Initiative and director of the New York State Office of Climate Change, discusses …