ENVIRONMENT -- FORTUNE 500 EXECUTIVES TESTIFY IN SUPPORT OF MANDATORY GREENHOUSE GAS LIMITS: Last month, a coalition of 10 major corporations and four environmental groups launched the United States Climate Action Partnership. (USCAP). The group pledged to push the federal government to institute a "mandatory economy-wide, market-driven approach to climate protection," with the specific goal of reducing greenhouse gas emissions by 60 to 80 percent from current levels by 2050. (Learn more about USCAP here.) Yesterday, several of the CEOs -- including Chad Holliday of Dupont and Peter Darbee of PG&E -- testified before the Senate Environment and Public Works Committee. Darbee called for the United States to be "at the forefront of addressing global climate change," while Holliday said "voluntary efforts alone will not solve the problem." "We see a whole suite of technologies to solve these problems," Holliday added, "and we think the uncertainty of what regulations will do are holding companies back." Global warming denier Sen. James Inhofe (R-OK) labeled the company chairmen "climate profiteers." Meanwhile, Sen. John Warner (R-VA), who could be a critical swing vote on climate change legislation, "said the testimony by corporate leaders could influence many lawmakers to reconsider their opposition to regulation." "You've got my attention," Warner said.