Rewinding fast backward reveals that when the Kyoto Protocol was opened for signature 18 years ago, on March 16, 1998, only six countries signed it on the opening day. Four of them were small island countries. When the Paris climate deal was opened for signature at UN headquarters on Earth Day, April 22, 2016, a whopping 175 countries lined up and inked the deal. Never before in history have so many countries signed an international accord in one single day in one ceremony.
The singular credit for conceiving and championing the Nuclear Security Summits unarguably goes to US President Barack Obama. In 2009, he called nuclear terrorism one of the greatest threats to international security and initiated global dialogue. The first summit was held in 2010, when about 50 world leaders drew the Washington Work Plan to contain, prevent and counter nuclear terrorism by better protecting nuclear radiating sources from theft and misuses like making 'dirty bombs'.