Spain’s drought-stricken region of Catalonia will install a floating desalination plant to help the city of Barcelona guarantee its drinking water supply, regional authorities said Thursday. Barcelona already relies on Europe’s largest desalination plant for domestic use to compensate over three years of below average rainfall that have led to a historic drought made worse by climate change. In February, Catalonia’s regional government declared a drought emergency for much of the surrounding region. Now Spain’s second-largest city will get a temporary second desalination plant in its port late…