The future of Pa. forests; the rebirth of a western Pa. river; the right to sign a gas lease

Summary: Researchers say too many deer and invasive plants are threatening the long-term survival of Pa.'s forests. A filmmaker of a new documentary about a massive effort to clean up a Western Pa. river says it's a hopeful story. The author of a book about individual liberty and private property rights argues that signing a gas lease shouldn't be one of those rights.