Greenwire: U.S. EPA has added dozens of scientific accounts about global warming threats to a key document that is expected to help drive federal regulations for curbing U.S. emissions of greenhouse gases, according to an agency draft (pdf) obtained by Greenwire. Twenty-eight EPA scientists, engineers and other career employees are now working on a nearly 2-year-old “technical support document” that synthesizes climate research on everything from melting sea ice to forest fires and air …