It's 100% real. Any long-view of world climate shows that the climate is always changing. It is currently warming, that much is well established. No one with any sense is denying global warming at this point.
The hot topic is Anthropogenic (Anthropocentric? Anthropological?) Global Warming, or AGW, which is still a huge unknown. I.e. whether or how much the Earth would be warming if there was no impact from humans is not known.