Tom Carper actually said...

we want to make sure that what we are doing, if we are going to move from E10 to E15, the effect on the environment.

the concern is related to the volatility in the market used by refineries to comply with the renewable fuel standard.

In 2007, Congress took a number of steps to try to change our energy future.

I think I have some reservations about the legislation that is before us.