Prior to humans industrializing the Sahara desert was green, 11,000 - 5,000 years ago. https://www.nature.com/scitable/knowledge/library/green-sahara-african-h

Prior to humans industrializing the Sahara desert was green, 11,000 - 5,000 years ago. https://www.nature.com/scitable/knowledge/library/green-sahara-african-humid-periods-paced-by-82884405 https://www.nature.com/scitable/knowledge/library/green-saha... The world regularly adjusts, California has had more fires historically (and less). https://www.pnas.org/content/early/2012/02/09/1112839109 https://www.pnas.org/content/early/2012/02/09/1112839109 I agree things are changing, but it's not clear who or what is causing it. That's really my only thoughts on the subject. Seems CO2 has a smaller impact than what ever has caused the Sahara to turn into a desert.