Erratic rains and combination of riverine, urban and flash floods have unleashed unprecedented global climate-change-induced disaster since June

Haitian police have fired tear gas at thousands of people marching in the streets of the capital, Port-au-Prince, to protest against the government’s handling of crippling fuel shortages and soaring prices.

The emergency ward at the main government hospital in Sehwan, a small town in southern Pakistan, is overwhelmed. On a recent visit, Reuters witnessed hundreds of people crammed into rooms and corridors, desperately seeking treatment for malaria and other...