There is not scientific consensus on the source of Global Warming because all that exist are unproven theories and conflicting evidence. The fact is there are no facts yet. But there are indications that the current warming is tied to solar activity and not CO2 (since the warming is NOT tied to CO2 levels but does track really well to solar brightness):

The current debate about global warming is “completely irrational,” and people need to start taking a different approach, say two Ottawa scientists.

Carleton University science professor Tim Patterson said global warming will not bring about the downfall of life on the planet.

Patterson said much of the up-to-date research indicates that “changes in the brightness of the sun” are almost certainly the primary cause of the warming trend since the end of the “Little Ice Age” in the late 19th century. Human emissions of carbon dioxide (CO2), the gas of concern in most plans to curb climate change, appear to have little effect on global climate, he said.

“I think the proof in the pudding, based on what (media and governments) are saying, (is) we’re about three quarters of the way (to disaster) with the doubling of CO2 in the atmosphere,” said Patterson. “The world should be heating up like crazy by now, and it’s not. The temperatures match very closely with the solar cycles.”

Got that. The CO2 levels have doubled yet the temperature has barely moved (a degree is not a big movement on the global scale). The media can barely add 2+2, let alone grasp the complex mechanisms of climate which the top brightest scientists have yet to unravel. So listening to these HS science drop outs is pretty useless.