The Bulletin of the Atomic Scientists [thebulletin.org] has set the Doomsday Clock [wikipedia.org] to "two minutes to midnight" [wikipedia.org] to reflect fears of a nuclear confrontation with North Korea, as well as the failure of world leaders to address climate change and other factors. The clock is now set as close to doomsday as it was in 1953 [bbc.com]:
The team of scientists singled out a series of nuclear tests by North Korea. They dramatically escalated tensions on the Korean peninsula [bbc.co.uk] and led to a war of words between North Korea and the US.
The BAS also referred to a new US nuclear strategy that was expected to call for more funding to expand the role of the country's nuclear arsenal. Rising tension between Russia and the West was also a contributing factor.
The "weakening of institutions" around the world in dealing with major global threats - including climate change - was another major concern, the scientists said. They also mentioned US President Donald Trump's "unpredictability", pointing to his often controversial tweets and statements.
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