Answer:
A 66 percent is sufficiently important to render the American Public universal, but the argument should add the results of the poll immediately and focus on the opposing views.
Also expounding about why some of those 66% are in support of investing in renewable energy, it could be because they are concerned about the economy and not just about the atmosphere, or they live in an area that produces maize for bio-ethanol.
A poll shows only a piece of information, no matter how scientific it is.