At last month’s (December, 1997) global warming conference in Kyoto Japan, delegates recommended emissions trading as one way to reduce global pollution by greenhouse gases. It would allow individual countries to trade or sell the right to pollute to other nations. In Chicago, the city is using its own emissions trading program to boost economic development and improve air quality. But after two years, the program’s results have been mixed. The Great Lakes Radio Consortium’s Steve Frenkel has more: