Worldwide food shortages and mass starvation will follow the deaths as Earth enters a new period of cooling, with temperatures not seen since the last Ice Age, researchers in a new paper say.
A senior Trump administration official, speaking on condition of anonymity says Washington was not prepared to say at this point whether it was a nuclear explosion but believed it did involve radioactive elements.
Hiroshima is stepping up efforts to keep the memories of the calamity alive, as the survivors of the bombing, known as hibakusha, get older.
US President Donald Trump accuses Russia of violating the 31-year-old nuclear weapons agreement which prohibits Washington and Moscow from possessing, producing or test-flying a ground-launched cruise missile with a range of 300 to 3,400 miles.
What will it take for France to take responsibility for its extensive nuclear testing across its colonies and what are the effects of the radioactive legacy they left behind?
Japanese PM Shinzo Abe, whose government has chosen not to participate in the UN Treaty on the Prohibition of Nuclear Weapons ,said at the official ceremony his country's responsibility was to bridge the gap between nuclear and non-nuclear nations.
The new US steps were the latest in a campaign aimed at forcing North Korea to abandon a weapons programme aimed at developing nuclear-tipped missiles capable of hitting the United States.
The International Campaign to Abolish Nuclear Weapons (ICAN) which brings together more than 450 organizations, was a driving force behind an international treaty on banning nuclear weapons that passed this year.
The designation allows US to impose additional sanctions and penalties against Pyongyang as it continues to pursue nuclear weapons programme.
Pyongyang's quest for nuclear weapons has its roots in the post-WWII history of the Korean Peninsula, and especially a war that has never ended.
North Korea says it carried out a test of what it described as a hydrogen bomb designed for a long-range missile.
Tremors felt by a nuclear test carried out by Pyongyang are estimated to be ten times more powerful than their last, Japan and South Korea claim.
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