Associated Press: TOYOTA’S Prius started out a decade ago as a risky experiment in green technology. Today it is the world’s first mass-produced petrol-electric hybrid car to hit 1 million in sales. The Prius went on sale in Japan in 1997 and is now sold in 40 countries and regions. Its popularity is increasing because of surging petrol prices and concerns about the environment. Toyota Motor Corp said yesterday 1.028 million Prius models had been sold to the end of April. Toyota sells …