Houston Chronicle: Democratic leaders of a key Senate committee on Monday vowed to forge ahead with climate change legislation despite a planned boycott by Republicans on the panel. Sen. Barbara Boxer, D-Calif., said the Senate Environment and Public Works Committee she heads would begin working on the global warming bill today — with or without the Republicans. “We look forward to working with them if they decide to participate,” Boxer said. “But if they do not, we will move forward in …