Business Green: UK insurance giant Aviva has announced it is to launch a clean tech investment fund designed to plough up to 500 million into a range of renewable energy projects around the world. The fund will be launched through Aviva Investors, the asset management arm of Aviva, the world’s fifth largest insurer. Aviva Investors chief executive Alain Dromer said that the new fund had been launched in response to growing demand for green investments from customers. “These initiatives …