BENGALURU, India — This year's powerful El Nino and the record global heat it's driving, along with severe droughts, wildfires and shrinking water supplies, could lead to nearly half a million more deaths worldwide by the end of February, according to a research report released Wednesday. The grim warning by the University of Chicago-based Climate Impact Lab says that as many as 451,000 more heat-related deaths between June and the end of February could be attributed to El Nino, compared with heat deaths expected in a typical year. The heaviest toll, the group says, is expected in poorer countries, already struggling with food insecurity and high energy costs, partly due to climate change and the fallout of the war in Iran. Michael Greenstone, a co-founder of the group and the study's co-author, said the heat danger will likely persist beyond February — even though this El Nino is expected to end by then. The fallout of the weather phenomenon could be felt well into next summer, he added. The research, he said, shows that heat is most dangerous in places that are already hot and rela