Green Century Funds was founded by non-profit environmental advocacy groups as way of providing an investment option for people who care about the environment. They offer was they call the "triple-green" approach in order for those who invest to receive competitive returns while also remaining confident that they are investing in sustainable companies. Green Century offers two completely fossil fuel free mutual funds - the Green Century Equity Fund and Green Century Balanced Fund. 

www.greencentury.com

Green Alpha is an asset management firm founded on principles of environmental stewardship. They believe firmly that the global economy must operate in an environmentally sustainable world. As a part of this approach, Green Alpha offers fossil fuel free portfolios. They believe in science driven, research based investments in the Next Economy. 

www.greenalphaadvisors.com