Here is a premise:
Well, there has been an excruciatingly technical argument about this, mysteriously known as the double dividend debate; the general consensus seems to be no, and that on balance pollution taxes would be more likely to reduce GDP slightly than to increase it.

Here is a hypothesis:
Pollution taxes would probably reduce GDP by at least 5%.

Here are the options: Choices:
1). yes.
2). it is not possible to tell.
3). no.
Is it possible to conclude that if the premise is true, then so is the hypothesis?
2).