COTD: Rain Forest Sahara

Twas the SUVs that did it mate:

Atlantic reversal | Watts Up With That?: "Several monthes ago I watched a National Geographic on the Sahara Desert showing fossils of crocs, clams, etc at various locations. It was shown that every 20,000 years the Sahara goes through a complete reversal from desert to a land of lakes and running rivers. It has done so several times and was last green 10000 or so years ago. They used layered sediment of dust off the coast of Africa to separate out desert from green eras. No mention of global warming or reversal of Atlantic currents."