For the car builders and the fuel providers their incentives are not and never will be the consideration of the planet BUT profit as upheld by the president himself who backed the American industry not to cut polution levels. So, where do we go from here.
The motor industry is a mamoth holding hands with the oil giants therefore should a wonder fue/oill be developed that bypassed the oil boys, I would suspect that some purchased legislation would be forced through to ensure that the newcomer with the bright idea would NOT succeed.
More efficient rotor technology coupled with an equal increase in engine efficiency is the obvious goal for the rotorcraft industry and it is apparent that there are those who are succeeding slowly but surely and it's great that there are these people working for the overall benefit of those who need helicopters versus the damage to the environment.