The global climate system is multifaceted, involving sun, planets, atmosphere, oceans, land, geological
processes, biological life, and complex interactions between them. Many components and their mutual coupling are still not fully understood or perhaps not even recognised. Believing that one minor constituent of the atmosphere (CO2 ) controls nearly all aspects of climate is naïve and entirely unrealistic. The global climate has remained in a quasi-stable condition within certain limits for millions of years, although with important variations playing out over periods ranging from years to centuries or more, but the global climate has never been in a fully stable state without change. Modern observations show that this behaviour continues today; there is no evidence of a global climate crisis.
