Mary Wiper, the leader of the Sierra Club in New Mexico, died Sunday after being struck by lightning while hiking with friends in Breckenridge, Colo. "This accident— it's just about as random as anything nature can serve up," said Lawson LeGate, the senior Southwest region representative for the Sierra Club and Wiper's boss. Wiper, 28, and two others were struck during a thunderstorm. The other two regained consciousness but were unable to revive Wiper. Wiper took over last May as Sierra Club's associate field representative for the Southwest. She oversaw projects in New Mexico, including the Sierra Club's participation in...