Reuters: With a hearty “All Aboard,” Phoenix launched a sleek new $1.4 billion light-rail system on Saturday amid uncertainty people will hop out of their cars and onto the train. About 75 people became the first riders of the 20-mile (32-km) system that snakes through a sprawling desert metropolitan area that includes the cities of Tempe and Mesa. Planners project building 30 additional miles of light-rail lines by 2025, but it has yet to be determined if the area’s love of cars will …