Inefficient energy use is what's bad for the economy, as is the collateral damage in terms of pollution, erosion of water resources, and international security that accompanies old-school fossil fuel and nuclear solutions on the supply side.
The securities the fund holds are rarely publicly traded and often are subject to collateral agreements that contain terms that must be considered in establishing their value.
Appreciation-sharing is a cost to the borrower and, if the terms are set correctly, those with the means to get through the decline in their collateral without giving up some of their upside will find it in their interest to do so.