"But they will not accept any outside monitors to ensure that they are indeed making the changes that they have promised to reduce the amount of carbon dioxide and other pollutants emitted per unit of economic output."
"He Yafei, the Chinese vice foreign minister, said China’s laws would guarantee compliance.
"And the Chinese refusal to accept verification measures could also lead to calls for punitive tariffs on Chinese goods coming into the United States. The House bill allows for the imposition of tariffs on goods from countries that do not constrain their carbon output. A group of 10 Democratic senators wrote to Mr. Obama two weeks ago warning that the Senate would not ratify any treaty that did not protect American industry from foreign competitors who do not have to meet global warming emissions limits."
.http://www.nytimes.com/2009/12/15/science/earth/15climate.html?hp | 
