North Korea may have detonated 250-kiloton bomb

The most recent satellite images of North Korea's nuclear site taken Friday show a greater number of surface disturbances following Pyongyang's sixth nuclear test than previous tests at Punggye-ri, U.S. analysts say.

Experts: North Korea exploded 100-kiloton bomb, risking disaster

 North Korea's sixth nuclear test may have involved a 108-kiloton bomb, according to a team of Chinese scientists.

Iraq puts out ISIS-set huge fires in Qayyara's oilfield

The Iraqi Oil Ministry on Tuesday said firefighters have put out fires at six oil wells near the town of Qayyara, which Iraqi forces freed from the Islamic State (IS) militants late last month.

Australia's Great Barrier Reef suffers worst bleaching

Australia's Great Barrier Reef is currently experiencing the worst, mass bleaching event in its history, with the overwhelming majority of reefs being ranked in the most severe bleaching category, according to a statement by the Australian Research Council (ARC) Centre of Excellence for Coral Reef Studies.

Japan turns on nuclear power four years after Fukushima (video Al Jazeera)

Japan has restarted a nuclear reactor for the first time since the Fukushima disaster in 2011, as the government seeks to reassure a nervous public that the industry is now safe with the new safety standards.

Japan marks 4th anniversary of tsunami disaster

Japan marked the fourth anniversary Wednesday of a quake-tsunami disaster that swept away thousands of people and sparked a nuclear crisis, a tragedy that has left visible scars on the landscape and continues to cause misery for many.