It is a striking feature of planetary convection systems that they exhibit directionality. One of the most significant factors determining climatic conditions on any planet is likely to be the effect of planetary rotation. This force operates independently of temperature and may well be more significant than variability in the chemical composition of atmospheric gas or the liquid of the oceans. In the upper atmosphere or stratosphere the jet stream flows from West to East. This fact is presumably explained by the direction of the earth’s rotation. Closer to the surface of the planet there is a contra-flow system that also exhibits a similar directionality. Water rising in the east falls on the land mass lying to the west. For example, water from the Indian Ocean falls in Africa. Water from the Atlantic falls in Brazil and water from the Pacific falls in Queensland and South Eastern Asia. As a result of such rainfall patterns, the major desert areas tend to lie on the Western side of continental land masses. In Africa there is Namibia and Western Sahara. In the Americas there are the deserts of Chile and California. In Asia much of the desert is found in the south western part of the land mass. A similar directionality exists in the surface liquid of the planet. The Gulf Stream is the best known part of a global conveyer belt of ocean currents that takes 1000 years approx. to circulate the planetary ocean system. The cool high density current flows in an east to west direction, whilst the faster flowing, lower density current flow in a west to east direction. It is a reasonable prediction that a similar conveyor belt must exist in the internal liquid core of the planet. Low density fast moving material will flow from west to east whilst a deeper current of hot dense material will circulate in an east to west direction closer to the centre of the planet. The speed of rotation is presumably fastest in the equatorial or tropical zone. I n regard to weather systems, one therefore finds the active tropical weather systems enclosed by stable high pressure areas in the polar regions. A cross section of the planet shows it to be composed of a gas atmosphere and two liquid zones, the inner core and the oceans. It is probable that this causal mechanism, planetary rotation, dominates the effects of minor variations in temperature or CO2 composition. There are other many factors effecting climate including the distribution of the continental land mass and the seasonal gyration in axis of the planet. The notion that a fractional change in the level of Co2 could have such large effects on climate is intrinsically improbable.