Temperatures reaching the high 40 degrees Celsius across India and Pakistan are no longer extreme weather events but a regular feature of the pre-monsoon season, scientists have warned. The finding comes from a rapid attribution study by World Weather Attribution, an international scientific collaboration that analyses the role of the human-caused climate crisis in extreme weather events. The study, published on Thursday, examined a prolonged period of extreme heat that struck India and Pakistan between mid-April and early May, when daily maximum temperatures exceeded 46C in several cities, causing at least 37 heat-related deaths in India and 10 in Karachi, Pakistan. The study found climate crisis has tripled the likelihood of such heat occurring and the window of dangerous temperatures growing longer every year.…