An increase in greenhouse gasses is not the cause of man-made global warming, says John Casey, president of the Space and Science Research Corporation.

In a Wednesday interview with "America's Forum" on Newsmax TV, Casey slammed the climate-change theory as fraudulent and said that studying the sun's cycles gives us a more accurate account of the direction our climate is headed.

"If you go back and look at how all this got started and look at the 30 years and the $30 billion [spent] in an attempt to make what's always been a weak scientific theory into something valid, we now know after all that effort, money and time, that the greenhouse gas theory as shown in the UN's own climate models has been a miserable failure in predicting climate change," Casey told Newsmax TV.

Casey, author of "Dark Winter: How the Sun Is Causing a 30-Year Cold Spell," added it's hard to get "why so many people believe in a theory that has been proven to be so unreliable versus models that are very reliable."

Instead of a future of global warming, Casey asserts we are in for a 30-year cold spell, a conclusion he arrived at by studying the "measurements of the sun's behavior."

The researcher's team looked at more than a dozen factors that affect the climate, with the sun having the most impact, the station reported. Most of the climate-change factors indicated an upcoming "global cooling phase," Casey said.

Based on the sun's last two major cold eras, research has shown "this particular warming event is the last 'hora of the sun,' if you will, and is a primary indicator that we're about to fall off a global climate temperature cliff into the new cold era," he said.

Casey's "Dark Winter" is available now.