Boy it pains me to see this happening to this coin it has so much going for it. If Bittrex drops the coin it might be a blessing in disguise anyway. It would give some time to get reorganized and build some buying pressure.
If this coin is merged mined, why the need to give have half the block reward to the miners, why not take most of the block reward for the biofuel or solar producers and add PoS to attract investors and secure the block chain? It appears that most of this mining community does not seem too supportive of environmental concerns and I'm doubtful that paying them generously is moving things forward at this point.
I would even think about doing a complete coin block chain lobotomy and start fresh with a PoS only coin. Offer to pay out some of the initial coins of the new coin to the holders of the GRE coin at some high ratio and use the rest for the foundation to generate interest with and pay the producers. Just don't pay out so fast that the price plummets faster than you can say run for the bank and all the investors get scared.
I would say this is a key statement...
... The demand comes from environmentally conscious carbon buyers ...
but there are few completely altruistic carbon purchasers and investors and producers need some faith in price points.
How can you solve green problems?
Nice to see you here SamWalters, this coin could use some of your marketing magic.

If the pricing reflected the true global cost/benefits I would think this coin would top bitcoin in value because clean energy can generate all sorts of things from healthy people to happy planet.