By Paul Homewood
Further to the post on the Sahel drought, HH Lamb included this graph in Climate Present, Past and Future:
It is a powerful reminder of the effect of global cooling on monsoon rains.
Scientists have known about these climatic shifts for many years.
Ghana’s Lake Bosumtwi, for instance, now has the remains of submerged trees standing in 20m of water. They grew there during the Little Ice Age, when rainfall was much less.
https://www.newscientist.com/article/dn16967-africa-trapped-in-mega-drought-cycle/