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.
Hiroshima is stepping up efforts to keep the memories of the calamity alive, as the survivors of the bombing, known as hibakusha, get older.
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.
Prime Minister Shinzo Abe says unprecedented rains and landslides cause tremendous damage even as 73,000 personnel are now involved in rescue and relief efforts across western Japan.
Officials put the toll at 48 with 28 others presumed dead after unprecedented rain forced several million people from their homes, media reports say, with more rain set to hit some areas for at least another day.
The Nobel peace laureate group ICAN's warning comes amid increasing tension in the Korean Peninsula over Pyongyang's nuclear ambition.
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.
Tensions have risen in recent months over Pyongyang's development in defiance of repeated rounds of UN sanctions.
The ship was hit in the final days of World War II just after completing a secret mission delivering parts of the atomic bomb used in Hiroshima.
Sunday marks 72 years since the US dropped the world's first atomic bomb on the Japanese city of Hiroshima.
He is the first Japanese prime minister to visit the site of the attack since 1951.
Tensions brim as Pyongyang celebrates the testing of a nuclear missile that caused a quake similar to the one caused by the atomic bomb dropped on Hiroshima.
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