I think there is room for well defined externalities to be captured in transactions, but handing out subsidies to special interest in the name of technology progress is ridiculous. Who picks the winners and losers? How long do you subsidize? Who pays when the costs of the new tech do not come down? Will you raise the cost of transportation so I can develop teleportation technology?
I think Spain is going to provide a painful lesson in what happens when you subsidize green tech, and unfortunately the people who pay for it are already impoverished.