The impression I got when skimming through their material is that this is more of a "political" statement than an investment. There are a few wrinkles between it & its competitors in the energy space, but none that struck me as significant.
That said, without regard to whether or not the asset space is a good investment going forward, I wouldn't take this as the vehicle. Note the small size of the fund. Means liquidity will be low, wide spreads. Coupled with the drag of expense ratio, I doubt the etf will get traction. Sometime down the road, it will be dissolved. Not meaning your investment will go to nothing, but that assets sold off & you'll get your "nav".
Why bother? If you want to support their message, have at it. Will cost a little, but not disaster. Happy investing -- let us know what you decide.