Harperdog writes "In 1999, Senate Republicans rejected the Comprehensive Nuclear-Test-Ban Treaty on the grounds that it wasn't verifiable. The National Academy of Sciences feels this is no longer true, due to new technology. Quoting: 'Technologies for detecting clandestine testing in four environments — underground, underwater, in the atmosphere, and in space — have improved significantly in the past decade. In particular, seismology, the most effective approach for monitoring underground nuclear explosion testing, can now detect underground explosions well below 1 kiloton in most regions. A kiloton is equivalent to 1,000 tons of chemical high explosive. The nuclear weapons that were used in Japan in World War II had yields in the range of 10 to 20 kilotons.'"