For example, as mentioned above, there are forcings like the sun's illumination which varies over cycles of a decade or more. Or, volcanoes which spread ash into the air and create a cooling effect. The principal positive feedback is water vapor. Warmer ocean water bubbles out the dissolved CO2 which then leads to more warming, more water vapor and so on. But there are negative feedbacks also.
Water vapor can form clouds which reflect incoming sunlight and thus have a cooling effect.
Finally, there are delays or inertias in the system, notably the oceans which can absorb large amounts of heat for a time. The oceans, therefore, act as a break on the climate system retarding change, delaying any warming and cooling. To make things worse, the regional effect of a climate change is not intuitive. Interrupting this current might plunge the North Atlantic into a deep freeze. Sooner or later, yes.