(Bloomberg) -- The heat wave engulfing the Mediterranean is set to intensify as another Saharan anticyclone threatens record temperatures from Italy to Greece. High winds are bringing added dangers, with a fire destroying homes outside Athens. On Wednesday, 23 of Italy’s biggest cities are subject to emergency heat wave warnings from the country’s health ministry. Warnings of record heat come as climate change increases the frequency of extreme weather across the Northern Hemisphere. (Updates with homes destroyed outside Athens and Italian emergency warnings in third paragraph)Most Read from Bloomberg Businessweek©2023 Bloomberg L.P.