Global Warming and Climate Change} Could the planet, support full plant life at 400ppm co2?

 Total surface area of land on the planet in square miles, 57,510,000 square miles, total area of 10 largest desert, 16,778,000 square miles, minus the two largest desert because they are not able to support plant life because they are the Antarctic desert at 5,500,000 square miles and the Arctic desert at 5,400,000 square miles. This leaves 5,900,000 square miles of deserts that could be replanted, not counting all of the semi-arid area's of the planet, that could have quite a bit of more plant life than they do at present. There is around 6,400,000 square miles of cropland, 12,900,000 square miles of pastureland. This leaves, 21,432,000 square of everything else, forests, mountains, town's and cities, and places to dry to use as pastures or to hard to get to. ( And everything in between, such as lakes, ponds, roads, etc. )  So lets concentrate on the 8 remaining, great deserts of the world. 5,900,000 square miles of almost no use of carbon. Compare this to the 40,732,000 square miles of lands that are able to have carbon storage of 1500 Gt/c in these soils, 560 Gt/c in plant and animal life for a total of 2,060 Gt/c divided into, equals .00005 Gt/c per square mile of good land. If we could develop the 8 great desert to the same level of carbon use, this would use up, .00005 times 5,900,000 equals 295 Gt/c taken out of the atmosphere. The atmosphere only has 800 Gt/c so the remaining amount after you take out 295 Gt/c would leave 505 Gt/c which would drop the level of carbon dioxide in the atmosphere down to around 253 ppm of carbon dioxide in the atmosphere! This would be high enough to keep the planet out of the next ice age, and in theory would allow us to also have the time necessary to completely get ourselves off of using fossil fuels, and into more sustainable energy! However it must be understood, that without mankind adding replacement carbon dioxide into the atmosphere, the levels of co2 will keep dropping around 2 ppm every year after this. Meaning that in only 25 years after we reach 253 ppm we will again enter the next and last ice age! It will be imperative that before that happens that we learn how to maintain the level of co2 in the atmosphere so that life can continue on the planet. Reach me at daniel.kadavy212@gmail.com   or by phone at 402-890-7946  Thank you Dan. Comments are always appreciated, even if you do not agree or question my point of view!