WASHINGTON — Climate change doubters may have lost one of their key talking points: a particular satellite temperature data set that had seemed to show no warming for the past 18 years.

The Remote Sensing System temperature data, promoted by many who reject mainstream climate science and especially most recently by Sen. Ted Cruz, now shows a slight warming of about 0.18 degrees Fahrenheit since 1998. Ground temperature measurements, which many scientists call more accurate, all show warming in the past 18 years.

“There are people that like to claim there was no warming; they really can’t claim that anymore,” said scientist Carl Mears.