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To: Cogito Ergo Sum who wrote (33069)	7/6/2012 3:19:23 PM
From: Brumar89	Read Replies (1) \| Respond to of 86352

20K yrs ago was during the Last Glacial Aridity Maximum/Maxima 22-13,000 14C y.a. I don't think the "greening" of the Sahara happened till after the end of the Ice Age: SAHARA (dates in Guo et al are given in 14C years ago on the left, approximate calibrated of 'real' dates are given on the right) Moist 9,500-8,200 14C ya (10,400-9,100 ya) Slight drying 8,200-8,000 14C ya (9,100-8,900 ya) Moist 8,000-7,000 14C ya (8,900-7,900 ya) Moderately dry 7,000-5,700 14C ya (7,900-6,500 ya) Moist 5,700-4,000 14C ya (6,500-4,500 ya) Very dry - as dry as at present - 4,000-3,800 14C ya (4,500-4,100 ya) Slightly moister than present 3,800-3,500 14C ya (4,100-3,700 ya) After 3,500 14C ya (3,700 ya). Remaining about as dry as at present

To: Cogito Ergo Sum who wrote (33069)	7/6/2012 8:55:03 PM
From: Bilow	3 Recommendations Read Replies (1) \| Respond to of 86352

Hi TBS; People reading your terse post might not catch the implication of the map of a very arid Africa. 16 to 20,000 years ago was at the end (coldest part) of the most recent ice age. During these (very cold) times, the planet becomes very dry. Cold oceans have less evaporation and therefore a cold earth has less rainfall (what goes up must come down and water vapor comes down as rain). The result is that the tropical rain forests mostly disappear. Same thing applies to most of the forests on the rest of the planet. This is usually a cold dry planet. This very dry Earth is the normal situation for the planet in that the planet is in ice age around 80 or 90% of the time. The vast majority of our tropical rain forests are only a few thousand years old. In a few thousand years (assuming mankind does not keep the planet warm one way or another) those forests will die again. In that sense, the deforestation being done in the 3rd world may, by raising CO2, have some small part in preserving the remaining rain forests for some short time. The global warming alarmists tell us about droughts as a result of global warming. No. The typical result of a warm globe is more evaporation from the oceans and more rainfall on the continents. This is a matter of very very simple and direct physics, much simpler than the amplification of the CO2 heat effect that they are so sure about (but which keeps getting reduced in peer reviewed literature). So instead, they've moved on to the subject of "climate change". This is just a way of changing the normal human conversation about the weather into purported support for catastrophic climate change effects. No, weather and climate has always been here and will always be. -- Carl