Miami-Dade’s rejection of a 20-foot wall to combat storm surge strengthened by climate change was the right move. Now the federal government is reconsidering.

An autonomous excavator developed by researchers at the Federal Institute of Technology (ETH) in Zurich, Switzerland, has successfully constructed 19.6 ft. tall and 130 ft. long wall.

How much of the border already has a wall or a fence? Roughly one-third of the U.S.-Mexico line, ... But even the 18-foot-tall steel barriers can be scaled in seconds by a reasonably athletic person.