Climate change has increased by at least 100 times the probability of a stifling heat wave like the one at the end of April, which affected especially Portugal, Spain, Morocco and Algeria. The projection is part of an investigation by an international team of climatologists from the World Weather Attribution (WWA) network, which has published data from an “express” analysis of the relationship between climate change and the high temperatures at the end of April in southwestern Europe and North Africa. “This warmth would have been almost impossible without human-caused climate change”, says the report’s authors, suggesting temperatures were up to 3.5 degrees higher than they would have been in a scenario without a climate emergency.