In April, a huge mass of hot air settled over the western Mediterranean, causing a record heat wave in Algeria, Morocco and Spain. In some places, thermometers reached more than 20 degrees C more than expected for this time of year. The weather was so extreme that scientists quickly concluded that it would not have been possible without human-caused climate change. Climate change attribution has made great strides over the past decade. Scientists are now able to say with increasing confidence that extreme weather events were more likely because of higher concentrations of carbon dioxide in the atmosphere. The academic papers published in this area are complex, many of them mathematical and almost completely incomprehensible to most people. But the main message that comes out of this work is very simple: Climate change, once thought to be a distant threat, is happening now, and it's killing people. (James G. Dyke)

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