The U.S. Senate considered a series of amendments today to a bill that would force construction of the Keystone XL pipeline. Democrats know they will be unable to block passage of the bill, but are trying to get senators on record acknowledging the existence of climate change. One amendment that would “express the sense of the Senate that climate change is real and not a hoax” passed by 98 votes to 1 (roll call). The yes camp included Iowa Senators Chuck Grassley and Joni Ernst as well as possible Republican presidential candidates Ted Cruz, Rand Paul, and Marco Rubio. Laura Barron-Lopez reported for The Hill that most Republicans rejected a separate Democratic amendment which stated that “climate change is real and human activity significantly contributes to climate change.” Grassley, Ernst, Cruz, Paul, and Rubio were all in the “nay” group on that amendment. From Barron-Lopez’s story:

In an attempt to provide political cover for Republicans, Sen. John Hoeven (R-N.D.) put forward an alternative that expressed the sense of the Senate that the Keystone oil pipeline would not significantly impact the environment or contribute to global emissions. The provision included a line stating that humans contribute to climate change but without the word “significantly.”

Fifteen Republicans voted for that amendment, including Paul, making him the only 2016 contender to go on record as saying that human beings contribute to climate change.

Neither Grassley nor Ernst voted for the Hoeven amendment (roll call). I assume that if they do not accept any human contribution to climate change, they would not be open to any government policies aimed at reducing greenhouse gas emissions.