Slowly, just like the planet's climate, the debate shifts. Rather than merely proving the existence of global warming, the United Nation's recently released 2,000-plus page report which seeks to finally answer the question: How responsible is humanity?

This isn't the first major research project put forth by the United Nations and its Intergovernmental Panel on Climate Change (IPCC) nor is it the first time the panel has sought to quantify human involvement. According to The Economist, the IPCC might not have even suspected mankind until 1995, when it first surmised a link between human activity and climate change. The first report, in 1990, attributed concerning environmental changes to "natural variability." By 2007, however, the panel charged humanity as 90 percent culpable. In the latest report released in full on Monday, the number climbed to 95 percent.

IPCC's objective to track human involvement has spawned a new set of critics not necessarily disputing the existence of global warming, but the level of human involvement.

"Nobody has ever proven for 100 percent that the long-term warming is man-made," Anastasios Tsonis, a professor at University of Wisconsin-Milwaukee told FOX News. "In my educated guess I will think something like less than 30 percent."

Another critic speaking with FOX, Judith Curry of the School of Earth and Sciences at Georgia Tech, believes the finding that 95 percent of climate change is caused by humans is more revealing of IPCC's mission than actual reality.

"I'm not happy with the IPCC," she told FOX. "I think it has torqued the science in an unfortunate direction."

Of course, there are still those who debate global warming as a real phenomenon, at least since 1998. Besides previous errors in projecting the rate of climate change (one being the rate of glacier loss in the Himalayans), the IPCC's recent findings, according to critics, does not completely explain the stabilization of global temperatures over the last 15 years - even as this very question was a main bullet point of its research before undertaking the massive project.

The panel came to several conclusions: (1) that 15 years was too small a sample size to make any true conclusions and (2) the heat has increased, but not necessarily the temperature. The extra heat is absorbed by the ocean. Further data in the IPCC's report supported increases in water temperatures.

By the time of the next report, maybe the IPCC will have more definitive answers relating to humanity's influence on global warming. But, as commented on in The Economist, the most recent report may be its last as many critics have pointed out the need for more frequent and timely research rather than multiple year long projects.