The return of supersonic planes could mean serious pollution problems

Supersonic travel died out in 2003, when the last 100-passenger Concorde jet settled down on a London runway.

The costly planes were doomed by their speed: The jets created sonic booms when they broke the 767 mph sound barrier, sending thunderous rumbles to the land below. For this reason, supersonic planes have long been banned from flying over land, ultimately making the jets unprofitable.

But a decade and a half later, supersonic planes are threatening to return, and while the speeding...

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