Global warming made the heat wave over parts of Asia in April at least 30 times more likely.
Researchers draw that conclusion in a new so-called attribution study from the World Weather Attribution (WWA) network.
Temperatures of 40-45 degrees were recorded in parts of India, Bangladesh, Laos and Thailand. It was at least 2 degrees warmer than normal for that time of year.
Heat waves that used to happen once a century in Bangladesh and India are now expected every five years. The heat that hit Thailand and Laos would not have happened without the changes, according to the researchers.