Perpetual motion machines would violate the first and second laws of thermodynamics. Simply put, the First Law of Thermodynamics states that energy cannot be created or destroyed, only transformed from one form to another. A perpetual motion machine would have to produce WORK WITHOUT ENERGY INPUT, which is impossible.
The Second Law of Thermodynamics states that that an isolated system will move toward a state of disorder. Additionally, the more energy is transformed, the more of it is wasted. A perpetual motion machine would have to have energy that was never wasted and never moved toward a disordered state. Also the 2nd Law states that a warm object will always warm a cool object and heat flow never goes from cold to warm. CO2 radiates from the surface of the Earth (15 C) into the upper troposphere (- 50 C), where the Alarmists say then is “reflected” back and warms the Earth’s surface, this action is in violation of the 2nd Law of Thermodynamics, in other words, Alarmist pseudoscience says that an “ice cube” can heat your cup of coffee. LOL