Even as the White House rolls back national climate change programs, California is moving forward on a cap-and-trade system to reduce greenhouse gas emissions. Yet the Golden State still has some of the highest air pollution in the nation from other pollutants its industrial plants spew. A new bill would use California’s cap-and-trade rules to […]

Ontario’s program will connect with California’s and Quebec’s, adding momentum to efforts to combat global warming.

The big idea of companies trading rights to emit greenhouse gases has floundered in Europe.

The system reduced American utilities' sulphur emissions by 70 percent.