Is climate change in fact cyclical?

There is mention in an Associated Press article by Beth Duff-Brown entitled "Warming experts stick their heads in the clouds - Water droplets found where ice crystals should be above Canada's Arctic" of the purported fact that climate change is in fact cyclical. This is antithetical to the concept that global warming and climate change are by definition man-made phenomena.

The article quotes Russ Schnell, director of Observatory and Global Network Operations for NOAA, as noting that:

... climate change is cyclical — that the planet’s vegetation, over millions of years, sucks in and spits out carbon dioxide.

“All the carbon dioxide in the coal and oil was once in the air. The plants took it and it went into the oceans or into the ground — and now we’re taking it back out,” says Schnell.

“The cycle is the same today, only you’re taking something that took 100,000 years and doing it in one hundred years,” he said. “There’s a point where animals can’t change fast enough, there’s a point where plants can’t change fast enough, so they’ll either compete it out or go extinct.”

The mention of vegetation reminds me of the fact that I would like to hear the scientific basis for believing that carbon dioxide and not deforestation and particulate pollution is the true cause of global warming.

Once again, it soulds to me that a lot more research is needed to apply Darwinian evolution and natural selection to the process by which scientists come up with their narrative stories that masquerade as settled theory.

-- Jack Krupansky