1.   But critics of the theory in the United States say global warming scenarios have not been proven, and that the cost of cutting greenhouses gases threatens U.S. industry.

2.   But critics of the theory in the United States say global warming scenarios have not been proven and that the cost of cutting greenhouses gases threatens U.S. industry.

3.   Critics say global warming scenarios have not been proven and that the pact threatens American industry.

4.   Critics say global warming scenarios have not been proven and that the pact threatens industry.

5.   Critics say global warming scenarios have not been proven and that the costliness to achieve the cuts in the pact threatens American industry.

6.   Critics say global warming scenarios have not been proved and that the pact threatens American industry.