Public opposition to data centers in the U.S. is growing due to concerns over environmental impacts and local disruption. Politicians are responding to this backlash by reevaluating regulations and policies related to data center development.

Madrid's metro system expanded from 71 miles (114 kilometers) in 1995 to 197 miles (317 kilometers) in 2007, making it one of the fastest-growing metro systems globally. The expansion was completed at a significantly lower cost compared to similar projects in other cities.