Six former heads of the Environmental Protect Agency — five of them Republicans — accused the Bush administration Wednesday of ignoring efforts to curb global warming and other environmental problems. The ex-EPA chiefs were attending a gathering to commemorate the agency’s 35th year anniversary. The Bush administration has rejected a slew of national and global environmental measures, including the Kyoto protocol, which sets mandatory controls on carbon dioxide. Lee Thomas, who served under the Ronald Reagan administration, said: “if the United States doesn’t deal with those kinds of issues in a leadership role, they’re not going to get dealt with. So I’m very concerned about this country and this agency.”