Scientists blame climate change and over-extraction of water by farmers in the region.
Simon Reeve, BBC TV presenter and author, in a publicity photograph taken while travelling around the Tropic of Cancer, the northern border of the tropics region. On this leg of the journey he travels across North Africa to Libya (crossing several international borders that have been closed to foreigners for decades).
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{{Information |Description={{en|1=Simon Reeve, BBC TV presenter and author, in a publicity photograph taken while travelling around the Tropic of Cancer, the northern border of the tropics region. On this leg of the journey he travels across North Africa