Plenty of climatologists and scientists disagree as to the exact cause of global warming.
Like all hot-button issues, this one has been twisted for political gain - this time by the socialist left who seek a global authority empowered to chastise the 'selfish' polluting nations.
Predictably, the UN has valiantly stepped forward to save mankind from itself. In fact, the unbiased UN is largely responsible for funding a myriad of climatological studies that conclude co2 = global warming.
Long before humans industrialized, climatic epochs occurred with astonishing regularity. Take for instance the most recent ice age. Where were our cars to serve as the catalyst for that radical climatic shift?