The City Council of Arlington, Texas, approved a plan last month to contribute half the $1 billion cost of a new, air-conditioned baseball stadium for the Texas Rangers. If all goes to plan, it will be the team’s third stadium since it relocated from Washington in the early 1970s. Taken together with other recent deals, it sure looks as though American cities are on the verge of another stadium building boom. The bad news for critics of publicly financed stadiums-and there are many of them-is that the outgoing cohort of Major League Baseball stadiums didn’t last very long. Of the 17 ballparks that opened between 1960 and 1982, only four are still in use. Among those that have already closed, the average lifespan was 31 years.