Global warming and Climate Change} Formations of deserts?

Global Warming and Climate Change}Question #5. Are the formation of desert only caused by low carbon dioxide in the atmosphere? There are three main needs for a full range of plant life in any particular place. They are all important, just needed in different strength's and amounts, carbon dioxide, water, and the sun. Having too much of each, can be just as bad as too little. This is also true for Ocean plant life. However desert's on land can also be created by having too much of other thing's as well. For instants, salt in the soil can stop most terrestrial plant life, until enough rains have washed the salt either out of the soil or taken it deep enough down so that the plants root system can still nourish the plant without entering the salt zone, With the movement of the great plates of the planet, many times over the history of the planet. Part's of salty's sea's would become isolated from greater part's of the same seas, and slowly over time or quickly, by earth movement these sea's would dry up or drain away. Leaving vast amount's of salt behind, causing desert and desert like areas. Desert's can also can be created by mountain that will limit the rainfall on one side or the other. This all being said, plant life can survive with a lot less, need for water, when the level of carbon dioxide is high in the atmosphere! This is because the stoma of the plants does not need to open up as wide or for as long. Keeping what water is in the plant, and not losing it in the respiration process. What this all boils down to, is yes there can be several factors involved in desert formation, but what the planet started to face 2.5 million years ago, with carbon dioxide levels approaching 200 part's per million was the start of the desert and semi-arid areas in sizes that the planet has not seen in million's of years! And is still continuing to this day, but in the last 100 years it has not been the reduction of carbon dioxide in the atmosphere, as much as man's over grazing and farming of borderline areas. daniel.kadavy212@gmail.com  or 402-890-7946 U.S.A.