DVM group – provider of the most comprehensive range of integrated building services in Hungary - announced its support for World Wildlife Fund's (WWF) global Earth Hour initiative that will take place for the tenth time on 19 March, 8:30 - 9:30 pm local time. Earth Hour is a movement that unites cities, businesses, schools, organisations and individuals around the globe by turning out lights for one hour in a symbolic and unified call for action on climate change.