Acid-treated lignin emits sulfur dioxide when burned.

FORBES: Ethanol

Ferretti, vice president at the Chicago Climate Exchange, extolled emissions trading, noting that the practice had helped bring sulfur dioxide and acid rain under control much less expensively than traditional command-and-control regulation.

FORBES: Carbon Emissions: The Next Sarbox

Media-fueled alarm about acid rain provided a basis for legislation to create markets for buying and selling excess sulfur dioxide (SO2) and nitrogen dioxide emission credits, and Project 88 became the Clean Air Act of 1990.

FORBES: Magazine Article