The amendment was expected to fail, but Republicans parsed the words of the amendment, arguing they could vote for it but at the same time believe that climate change was not man-made.
The lone no vote was from Sen. Roger Wicker of Mississippi.
The amendment was designed in part as a jab at GOP Sen. James Inhofe of Oklahoma, who has questioned the science of climate change.
Inhofe voted for the measure, arguing that the true “hoax” is that climate change is the result of human activity.
“Climate is changing, and climate has always changed, and always will, there’s archeological evidence of that, there’s biblical evidence of that, there’s historic evidence of that, it will always change,” he said on the Senate floor. “The hoax is that there are some people that are so arrogant to think that they are so powerful that they can change climate. Man can’t change climate.”