Baltimore can’t afford another harbor disaster

It happens with such frequency it’s almost become a cliché — a terrible disaster occurs, and in the following weeks, it’s revealed that alarm bells were ringing for years before the tragedy, warnings that went unheeded until it was too late. Officials knew before Hurricane Katrina in 2005 that New Orleans’ levees would be unable to withstand a devastating storm. NASA in 1986 overruled engineers who insisted the space shuttle Challenger was unsafe for launch.