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Scientists the Sahara desert is twice as old as we previously . Science books generally the Sahara is around three million years old. However, a new study from a centre for climate research in Norway says it could around seven million years old. Researchers computers to try and when large parts of North Africa desert. Their tests showed that global warming seven million years ago a lot of the land in what is today the African nation of Chad. A sea the Tethys Sea started shrinking. This made the African summer monsoons less frequent, which form sand dunes in Chad. The scientists say this is how the Sahara first started.

The Sahara is one of the world's best-known and largest deserts. It about 10 per cent of the whole African continent and large parts of Algeria, Chad, Egypt, Sudan and other nations. The sands from the Atlantic Ocean in the west to the Red Sea in the east. Not everyone that the Sahara is as old as the Norway research says it is. Stefan Kröpelin, a geologist in Germany, says real geological evidence is to be sure. He said the Norway research is on numbers and not evidence, : "Nothing you can in the Sahara is older than 500,000 years old". He that our knowledge of the Saharan climate is only from 10,000 years ago and that our knowledge "full of gaps".