I have had my super with Australian Ethical Investment (AEI) since 2006. They are a truly green fund. They pioneered the ethical positive/negative investment screen in Australia, see Australian Ethical Charter.
Through my work I have got to know them well. In my observations they have a good work ethic, with the high ethical standards but also practical and trying to ensure good returns for customers. If you want to know your funds are being invested in the best possible way, as practically as possible and with historically good performing funds, low and high risk options, AEI are the fund.