We've had various discussions on aspects of sustainable investing in other threads, namely coal divestment, funds that focus specifically on renewable energy, etc. What I haven't seen is a thread dedicated to sensible sustainable investing that's not so narrowly defined. In other words, if the goal is not specifically to divest from a particular negative sector or focus on a specific positive sector, but instead simply to build a relatively balanced portfolio which includes solely low-carbon stocks while roughly mirroring the attributes of a traditional index fund-where to start? What fund(s) would you use to build such a portfolio? I understand that by definition if we're excluding carbon-intensive companies we're not going to get the exact attributes of an index fund. Rather, I'm looking for specific advice on how to build something as 'Boglehead'-like as possible while keeping it low carbon. I'm aware of fossilfreefunds.org, which seems like a good starting point. I was recently sent a link to Aspiration's Redwood Fund (REDWX) as one possible investment choice. Rates well on fossilfreefunds and seems to be doing well. So, discuss! Have you converted your own portfolio to low-carbon funds? (No fair replying with 'I'm 100% in TSLA!' This thread is focused on more balanced portfolios.) If so, what do your funds and allocations look like? Is there a service out there in the vein of Betterment that has options for low-carbon choices? (I've suggested this to Betterment and it's on their radar but not imminent.) Thanks.