The U.S. and USSR agreed not to build defensive missile systems and thus to limit escalation of the nuclear arms race.
Peace, faith, environment and labor organizations are mobilizing for the Peace and Planet conference and march at the United Nations April 24-26.
While not seen as an environmental issue at the time, nuclear weapons pose the single biggest threat to the Earth's environment, scientists warned in 2006.
The global nuclear industry faces tough times - and activists feel optimistic - in light of historic news that Japan has decided to abandon nuclear power.
In Japan and around the world, tens of thousands are marking one of the worst atrocities in modern history, the only time atomic weapons were ever used against human populations. They are vowing to never let it happen again.
This comes one year after Japan was struck by the earthquake- and tsunami-triggered Fukushima Daichi disaster.
Last year's Fukushima nuclear catastrophe was "man-made" and "the result of collusion" between the government, regulators and the company.
The Games have become a hopeful, yet often futile, source of economic revitalization and jobs for the host city or country, which instead often winds up in debt. Greece is case in point.
Saudi Arabia recently announced its intention to launch its own nuclear program, saying it needs to diversify its energy sources.
Created in 1947 to represent the relative closeness of the threat of nuclear disaster, the clock's face has been adjusted twenty times.