News of Note

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* Pittsburgh's Ninth Street Bridge is now the Rachel Carson Bridge, an Earth Day tribute to one of southeastern Pennsylvania's most famous natives and an ecologist known worldwide for her environmental classic Silent Spring. Carson grew up in Springdale, Pennsylvania, and spent her childhood playing alongside the Allegheny River. "Pittsburgh's air, water, and land are much cleaner today because of her efforts and the efforts of those she Inspired," Dan Onorato, Allegheny County chief executive, said in a release.

* Another reason to fear global warming: poison ivy. A Reuters story warns that when carbon dioxide levels were increased to expected mid-century amounts, poison ivy-that viney, woods-loving scourge of campers everywhere-grew more than twice as fast and emitted more of the substance that causes us to itch. Study lead author Jacqueline E. Mohan of The Ecosystems Center at the Marine Biological Laboratory in Woods Hole, Massachusetts, warns no one is safe. "Poison ivy is a remarkable plant. It can grow just about anywhere."

* With hundreds of acres of forests disappearing each day, the world would do well to follow Prance's example. …