To fight or to flee? These are the stark choices Maria, a single mother from the Bangalala midlands of Tanzania, faces repeatedly.

“After the rains failed for a few years, some neighbours claimed our trees were drawing too much water from the ground. We cut them down. Our harvests fell. My mother closed her stall at the local market. That is when my father and I moved from the midlands to the Ruvu Mferejini river valley.”

Maria, whose dramatic story has been told by the United Nations organization leading in combating desertification, goes on to say: “My brother quit school to help the family. He went to find work but he does not earn enough. My mother stayed in Bangalala so that my daughter could go to school because there are no schools in the valley.”

“But where we moved to, my crop also failed last year. That is why early this year I moved yet again, but I left my father behind. I hope to farm here much longer, as I am sure the people I left behind with my father will have to move too. But when will this moving end? I cannot afford it anymore.”

This is not an isolated case–Maria is in the same situation that women in Darfur, Mali, Chad or Afghanistan were in before local conflicts over water or land turned into civil wars, sexual violence or genocide, reports the United Nations Convention to Combat Desertification (UNCCD).

“Nor is this situation unique to sub-Saharan Africa where half a billion inhabitants are rural, a majority lives off the land and desertification is a constant threat to their livelihoods,” it alerts in its report Desertification, the Invisible Frontline.