It's somewhat of a fallacy that green is always more expensive than other options, especially if you've already got to adhere to decent standards. Companies are finding that eco-friendly processes and green energy can be the same cost, or even cheaper, that the old processes.

Also, it is possible for a country to become greener without shrinking its economy. There's a lot of economic theory that public investment brings public and private growth. Green infrastructure supporting green industries is already profitable in many places.