What happened to the mysterious humans of the Sahara?
The Sahara covers an area about the size of the United States and at one point that area was a lush landscape of grasslands and waterlands. Thousands of years ago the climate changed and slowly that area became desert. What caused that change? Was it a change in the magnetic pole moving from South to North (the opposite is happening today). Or maybe a shift in the Earth's axis (which is also happening now). Maybe the humans who lived caused the climate change by angering their Gods. Who knows?
Science doesn't but don't let that stop people from telling you that the science is settled on why global climate change is happening today.