...were it not for the fact that there are already several thousand versions of Monopoly out there.

Still, interestin' concept.

When I saw this I thought that while its only a game, its a nice idea, it can help send a message, until the articlae ended with "Free Parking".  Free Parking!  What a missed opporetunity, because any self-respecting environmental game updater should know that a central tenet of smart growth, the urban development model that brings us better, more efficient communities, require that parking be paid.  Paid at market rates no less, so that the car is not subsidized.  So we have incentives to use other travel modes.  Get it?  
At the next game update, change Free Parking to somthing like "Free Biking" or "Catch a Free Breath".  

like this is going to do anything except make corporate execs feel better.

The irony is that with distributed renewable energy there will be no tendency for consumer-unfriendly "monopolies".  Wind and solar can be placed almost everywhere, that's why it hasn't been so attractive for the utility monopolies that do exist in the present real world to invest in yet.  I hope the 'Community chest' drawing tickets include such items as:
Congratulations! You have just received a grant for energy conservation investments. Pay $200 into the center of the board, but now you can Collect $250 each time you pass GO for the rest of the game!!

Maybe instead of planting houses and motels on certain eco-sensitive properties, the players can plant trees and restore habitats with native species.

If the game pieces are made of recycled post-consumer paper (or how about recycled Tyvek!) , that would be even better.

Like the real life, the game would continue to be about making progress rather than outright victory.