Ron Johnson
Gage SkidmoreSen. Ron Johnson: He was for climate denial before he was neutral about it.

An ad campaign targeting climate-denying politicians appears to be having something of an effect.

Sen. Ron Johnson (R-Wis.), under fire for being a climate denier in a world ravaged by climate change, this week denied believing that humans are not warming the planet. Yet the senator still will not acknowledge the basic fact that humans are warming the planet.