Florian Gaertner | Photothek | Getty ImagesEurope's increasingly extreme summers are becoming an economic problem, with more frequent heatwaves driving up costs, disrupting businesses and weighing on growth. Huge wildfires have been raging in France and Spain, burning 300,000 acres and forcing the evacuation of 300,000 people. The scenes echo last year's Los Angeles wildfires, when blazes overwhelmed firefighting resources, triggered mass evacuations and destroyed thousands of homes. Meanwhile, extreme weather events such as Europe's wildfires are likely to impact countries' fiscal budgets, Zachmann said, as they pay for evacuations, firefighting, and infrastructure recovery. More heatwaves, more weather disastersWith a heatwave underway in the region, experts have warned that it could exacerbate the fires.