Now there is a stock that is a major player in carbon emissions trading called Climate Exchange Plc (OTC:CXCHF). Carbon emissions trading is the trading of permits to emit carbon dioxide and other greenhouse gases. It is way of meeting obligations under the Kyoto Protocol to mitigate global warming.
Climate Exchange Plc owns the Chicago Climate Exchange, Inc. and the European Climate Exchange, which provide futures contracts and options contracts of emissions. Goldman Sachs has taken a major position in this company.