Environmentalists say the pollution is likely to worsen because the companies [InterGen (a joint venture of Royal Dutch/Shell & Bechtel) and Sempra Energy Resources] are skirting U.S. laws by building in Mexico, where they are not required to offset particulate matter emissions - or air pollution - with community projects that reduce regional air contamination. A coalition of Mexican and U.S. environmentalists called the Border Power Plant Working Group filed suit in California to halt the power flow...