Treaty to limit CO2 should be followed by similar limits on other greenhouse pollutants
Thursday, October 22, 2009 - 14:49
in Earth & Climate
When world leaders meet in Copenhagen in December to hash out a treaty limiting carbon dioxide emissions, they should begin planning a future summit to address other pollutants - from soot to ozone - that don't remain in the atmosphere as long as carbon dioxide, but nevertheless are major contributors to global warming.