Dear Brian - I just saw this post when looking for ESG Tagging information.
Today - Mid October 2019 - the situation as described is in principle the same. Search for material ESG data - or better: the analysis' conclusions for the forseeable investment horizon of an investor as well the related information disclosed by investees - is still a lot of sounding the depth of a pond of black water by a blind by help of his white stick.
But the complexity of players on the regulatory side has significantly risen - EU TEG proposals, TCFD recommendations a.s.o. - gives guidance on the macro as well as micro level of decision supporting data. The key element lacking is in my view the challenge how to discount or monetize what has no ready and handy market price.
One interesting way is tested by ISO Technical Committee 207 environmental management. Several standardization projects by ISO TC 207 dive into the socio economic effects of environmental impacts and try to monetize as far as possible the effects as positive or negative price tag. (ISO 14007 determining costs and benefits of environmental impacts (internal and externalized, monetized or non-monetized), ISO 14008 Monetary valuation of environmental impacts and related aspects (focus on what can be monetized directly - e.g. markets - or indirectly - e.g. preferences). I am happy to share more information for those interested. By the way: Brand new is ISO TC 322 with a focus on sustainable finance.