I personally think that there is enouh tax on gas as it is, and some of that money is already being wasted on other stuff - re: filling the pockets of government officials.
But anyways: As for this idea, while I do like what the end result would bring us, I doubt it will ever happen cause when in the world have you seen a tax put on a product for the use of making that said product obsolete, or less used other than from cigarette products?
The gas companies are not going to benefit from this tax, so I doubt they would implement a tax that they were not going to see any money from.
It all comes down to the mighty dollar.
If it were the governmet that issued the tax, I would like it set up as a non-profit organization or something similar where their financial records would be available on demand by the public. If this were to be implemented, I want to see exactly where my 50 cents a gallon was used to research/test.
Now think about this:
In comparison: Since I do not smoke, and know a lot of people who have had long term health effect from smoking, I say tax the heck out of those products and use that money for research and anti-smoking campaigns.
I do not smoke, so I do not have a problem seeing ciggarette products taxed and am obviously in favor of it.
I use gas and petrol product daily so obviously I have a big problem with the tax.
As you can see, my decisions on these two very similar plans are swayed by whether or not I use the product.
Do you use gas products? If yes, then what is your opinion on the tax?
It would be a little different opinion you had than if you used a hybrid car, or a fuel cell car or walked (or used a Segway

) now wouldn't it?