How did a climate shift that took place 10000 years ago change the Sahara and nile river valley?

Around 10,000 years ago, the Earth's climate underwent significant changes, transitioning from the last Ice Age to a warmer, more humid period known as the Holocene. This shift led to increased rainfall in the Sahara, transforming it from a dry desert into a lush, green landscape with abundant vegetation and wildlife. As a result, human populations began to inhabit the region, engaging in agriculture and settling in areas like the Nile River valley, which benefited from both the Nile's water and the fertile lands created by the climate shift. Eventually, as the climate became drier again, the Sahara returned to its arid state, while the Nile continued to support civilization.