<p>Other polls that ask Americans how they feel about a proposed "cap and trade" system to control pollution have tended to produce positive responses. But those surveys never seem to mention what such a system might cost. The latest IBD/TIPP Poll laid it all out in a somewhat lengthy question and drew a very different response: By nearly 3-to-1, Americans oppose a cap-and-trade system that, if opponents are correct, could add $800 to $1,200 per household to energy prices.</p>