Why did the united states fail to ratify the kyoto protocol? the us congress did not want to support a free-trade agreement. the treaty threatened to limit the sovereignty of the united states. americans were concerned that the treaty would not protect the environment. the agreement called for only the united states to limit greenhouse gases.

I think it is: "Americans were concerned that the treaty would not protect the environment." Sorry if this is wrong!

The US Congress did not want to support a free-trade agreement.

Explanation:

The US congress blocked the treaty because most of the expectations from the country were not met, and they wanted third worl countries to accept that they´d also lower their CO2 emissions, otherwise the industries that were about to be heavily taxed by the States, would just flee to third world countries where they wouldn´t have to pay those taxes and profit would be larger with cheaper wages.

your answer will most likely be a.