Mark Hertsgaard's Guardian article reports that California governor Gavin Newsom, the most prominent US politician at Cop31, has endorsed a global fossil fuel phaseout and says California is "100%" behind the Santa Marta coalition, whose roadmaps proceed after petrostates blocked a similar effort at Cop30. The article suggests his statement could add momentum to the summit and raises the possibility the US might join the coalition if Newsom, widely expected to run for president, wins in 2028.