No, climate doesn't have a thermostat:Yes is does. Climate's main thermostat is carbon dioxide, We know this from studying past climate on the earth, where CO2 level is the most important single factor in determining the earth's temperature. Richard Alley has said this in his YouTube lectures. I THINK this is one where he says it; if not, I'll keep looking & try to post it:[URL deleted]
A thermostat is a component of a control system which senses the temperature of a system so that the system's temperature is maintained near a desired setpoint. The thermostat does this by switching heating or cooling devices on or off, or regulating the flow of a heat transfer fluid as needed, to maintain the correct temperature. The name is derived from the Greek words thermos "hot" and statos "a standing".