pBy Tom Doggett/p pWASHINGTON (Reuters) - The U.S. Environmental Protection Agency was set to announce on Thursday that it will begin to take a closer look at the environmental and human health impact of shale gas drilling, according to a U.S. congressman who wants to see more regulation of the practice./p a href=http://www.scientificamerican.com/article.cfm?id=epa-study-shale-gas-drill[More]/a