Landmark climate change legislation by Sens. Joseph Lieberman (I-CT) and John Warner (R-VA) was approved on Nov. 1 by the Senate Environment and Public Works subcommittee. The revised America's Climate Security Act of 2007 includes a number of changes making it more stringent than originally proposed, including newly-added language that would rope in emissions related to natural gas use by the residential and commercial sectors and provisions requiring EPA to issue recommendations for stricter emission limits if periodic scientific reviews so warrant.