As Congress begins to draft and discuss climate legislation, could the United States get a jump-start on scaling back the effects of climate change by regulating black carbon? During today's OnPoint, Durwood Zaelke, president and founder of the Institute for Governance and Sustainable Development, explains how the regulation of black carbon could play a significant role in slowing the nation's pace toward certain irreversible climate tipping points. Zaelke explains why he believes the Montreal Protocol can help mitigate climate change. He also weighs in on the domestic and international climate debates.