Think it's hot outside? "Good Morning America" wants you to think it is your fault - at least that's why an expert featured on the June 9 show told viewers it is hotter outside.

Stanford University professor Dr. Stephen Schneider said that methane and carbon dioxide in the atmosphere are making hot temperatures even hotter.

"While this heat wave like all other heat waves is made by Mother Nature, we've been fooling around by turning the knob and making a little bit hotter," Schneider said. "[W]e've already increased by 35 percent the amount of carbon dioxide which traps heat. We've added 150 percent more methane, which also traps heat."

Ironically, in 1971, Schneider co-authored a research article that explored both warming and cooling of the Earth, warning that a certain level of aerosols entering the atmosphere could trigger an ice age.