It added that “chaos reigns in much of the information ecosystem on which modern civilization depends”.
Rachel Bronson, BAS president and chief executive, said the world had now entered the “period of the new abnormal”.
She said “rhetoric” between the United States and North Korea had eased but remained “extremely dangerous”, while Russian and US relations were “unacceptably strained”.
She added: “We have entered a period that we call the new abnormal – this is unsustainable and unsettling.
“We appear to be normalising a very dangerous world in terms of the risks of nuclear war and climate change. The 2019 time should not be taken as as a sign of stability, but as a stark warning. This new abnormal is simply too volatile and too dangerous to accept.
“Recognising this grim reality we would like to announce it is still two minutes to midnight, remaining the closest to midnight the clock has ever been set.”
The countdown was established in 1947 by scientists who were working on the Manhattan Project to design and build the first atomic bomb.
Originally intended to warn of the threat of nuclear armageddon, the Doomsday Clock also takes into account the likelihood of other emerging threats such as environmental challenges and advances in biotechnology and artificial intelligence.