A small weight, "m1", added to one side represents warming forcings (e.g., excess #CO2).
Without feedbacks (valve between bottles closed), the weight causes a small tilt.
With positive feedbacks (valve open), the weight causes water to flow and a much larger tilt occurs.
The Earth has several known positive feedbacks (e.g., albedo, methane turnover, added water vapor).
#scicomm #climate #AbruptClimateChange
Get aware. Get ready. #ActOnClimate