The Bush administration has proposed rolling back protections for the nation’s wildlife by rewriting the Endangered Species Act. The proposed rule change would allow federal agencies to decide whether protected species would be imperiled by agency projects. This would eliminate the independent scientific reviews that have been required for more than three decades. The draft rules also would bar federal agencies from assessing the greenhouse gas emissions from projects that contribute to global warming and its effect on species and habitats. The Bush administration publicly announced the proposed regulatory changes on Monday, only after the National Wildlife Federation posted leaked documents outlining the administration’s plan. John Kostyack of the National Wildlife Federation described the proposed change as a “full blown attack on America’s premier conservation law.”