The climate is very complex and is effected by many factors of which CO2 is a one as stated by a large group of climate scientists as oppose to another group who try to say that the climate has only one control knob. CO2 has an effect and scientists are still beavering away trying to identify just how much or little it's effect is. There is another group comprised of Journalists, activists and politicians who make very unscientific claims about extreme weather and extinction of the human race etc.
