The Obama administration proposed new guidelines Wednesday that would boost the government's ability to protect streams, wetlands and other sensitive waterways from pollution. Business and property rights groups said the policy would stifle economic growth by generating more red tape for builders of homes and shopping centers, but environmentalists defended it as essential step to provide clean drinking water and protect waterfowl habitat. Administration officials said their goal was to clarify which waters are subject to federal regulation under the 1972 Clean Water Act, a question that two Supreme Court rulings in the past decade have not resolved. "Today about...