Final answer:
The U.S. Senate has historically opposed emissions reductions fearing economic repercussions. This was evident during the Bush administration's response to the Kyoto Protocol.
Step-by-step explanation:
The U.S. Senate has so far opposed emissions reductions on the grounds that it might hurt the economy. This concern was notably expressed during the George W. Bush administration, which argued that measures such as the Kyoto Protocol could potentially harm the U.S. economy. This stance reflects the broader issue of political divisions and economic interests that play a significant role in the United States' approach to international climate agreements.