German Chancellor Angela Merkel spent four days in early March 2011, like many around the world, watching the nuclear disaster in Fukushima, Japan, unfold on television. These events caused Merkel, a reasoned supporter of nuclear energy, to make a radical change in direction. On March 15, Merkel...

Pipelines that carry much of the world’s oil and gas snake through the depths of the Black Sea, the frigid waters of the Russian Arctic and cross some of the world’s most dangerous conflict zones. The value of these pipelines, oil and gas installations, and nuclear power plants makes them...