sally hayden, author of m fourth happening. sally hayden, author of my fourth time _ happening.e we _ happening. sally hayden, author of my fourth time we drowned, - happening. sally hayden, author of| my fourth time we drowned, thank happening. sally hayden, author of - my fourth time we drowned, thank you very much forjoining us on bbc news. around the world and across the uk, this is bbc news. scientists say that the recent deadly heatwave in west africa and the sahel would not have taken place without the impact of climate change. temperatures soared above 48 celsius in mali last month with one hospital linking hundreds of deaths to the extreme heat. researchers from the world weather attribution group say human activities such as the burning of fossil fuels and deforestation made daytime temperatures up to 1.5 degrees degrees hotter than normal in the region. let's speak to our environment correspondent matt mcgrath. matt, just explain what this survey found, what happened, and why it is happening? found, what happened, and why it is ha enin: ? found, what happened, and why