Hiroshima on Wednesday marked the 80th anniversary of the U.S. atomic bombing of the western Japanese city, with many aging survivors expressing frustration about growing support among global leaders for nuclear weapons possession for deterrence.

Australia’s Great Barrier Reef has suffered the largest decline in coral cover in two of its three regions over the last year, research released on Wednesday showed, following a mass bleaching of its corals that was among the worst on record.

The devastating cloudburst in Uttarakhand’s Uttarkashi district claimed four lives, while many others, including 11 Army personnel were missing. Rescue operations are underway.