Here are entered works on the practice of compensating for the carbon dioxide emissions produced by one activity or in one location, by voluntarily paying for a corresponding reduction in such emissions produced by a different activity or in a different location. Works on an internationally regulated, market-based "cap-and-trade" program designed to reduce the emission of polluting gases into the atmosphere by allowing participating polluting nations or companies to either reduce their total emissions or buy credits from less polluting nations or companies are entered under [Emissions trading.]