Business Green: Envision Solar International has launched a “solar tree” designed to charge the Chevy Volt. The company, which specialises in sustainable infrastructure, has unveiled CleanCharge, a solar-powered electric vehicle charging station connected to a large solar panel designed to shade the electric vehicle and charge its battery at the same time. The company has integrated CleanCharge into the large solar tree structure, which incorporates a solar panel mounted onto a trunk. The unit, …