Take a look at #SolarCoin and #Gridcoin. The former incentivises clean energy generation, the latter distributes its currency based on the amount of useful computations done.
There are answers, its just many in the crypto-space arent ready for change; irony for ya.
Well, crypto-space is not the only issue in this case. The changes in the hundreds of years old energy systems are the biggest issue. How to force the huge monopolists to change their energy systems? How to enable fair market competition? The energy transformation might take another 25 years and I believe that blockchain technologies can offer a lot in that transformation cycle.
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