U.S. ports could be facing another strike as the deadline looms next Wednesday to settle a union contract for 45,000 dockworkers on the East and Gulf coasts. A major sticking point has been automation. Proponents argue that technology can make ports cleaner and more efficient; critics point to lost jobs, high costs and mixed productivity results. While the cost-benefit analysis of port automation is complicated, there are places where the model appears to be succeeding, like Rotterdam in the Netherlands.