1. is the process by which land becomes desert
Desertification:
is the process by which land becomes desert

2. Case study: the Sahel
The Sahel is becoming more like desert with thin, dry, sandy soils
Soil erosion has created bare rock
Vegetation is sparse

3. The UN environment program took up combating desertification as a major part of its work. In 2010 it argued that desertification threatened nearly a quarter of the Earth’s land surface.

4. How have each of these factors contributed to desertification?
climate
humans
animals

5. Climate Drought: low rainfall since 1968.
Soils become dry and there is no water left in wells.
Trees die, grass withers and is replaced by poor desert scrub.
Crops fail and cattle feed on poor pasture.
Less roots to protect the topsoil, less humus; soils become more sandy and dry.
Wind erosion removes the soil, causing dust storms, leaving bare rock.

6. Human activity Population is high and increasing fast.
To increase food supplies more crops are grown and more cattle kept leading to over-cultivation and over-grazing.
Yields decline and cattle are undernourished and die.
Demand increases for water as population grows.
Trees are cut down for fuel supplies.
Less vegetation; more dry, bare soil; more wind erosion.

7. Animals/insects Locusts destroy the crops.
Overgrazing means all vegetation is eaten.
Animals trample the ground reducing it to dust.
Animals die and can’t breed.

8. What are the effects of desertification?

9. Starvation
Food and water shortages lead to malnutrition, famine, disease and high death rates.

11. Aid Programs
Large numbers of people become dependent on food aid programs.

12. Migration From rural to urban areas causing over-population in towns.
To refugee camps.

13. Solutions?
How can we solve the problems of desertification?

14. Solutions
In the short-term, provide food aid and water supplies to prevent suffering.
Improve water supplies by building large reservoirs and drilling deeper wells.
Conserve water in local small-scale schemes eg ‘magic stones’ in Burkino Faso.
Encourage sustainable farming practices (using locally-made tools, not tractors).
Provide drought-resistant seed such as millet (northern Nigeria).
Tree planting schemes to reduce soil erosion (Mauritania).
International action to reduce the causes of global warming.

15. Solving the Problems: the results
Nov 1992
Before and after animals have overgrazed and trampled the savanna.
Nov 1998

16. Solving the Problems: the results
Before
Which scheme do you think solved these problems?
After

17. Conservation Projects
Eden Foundation
Founded 1985 in Sweden Niger is one of the driest countries in the world, situated south of the Sahara desert. The people are poor and have neither money nor water to spare.
Their solution is to bring trees and bushes that can grow naturally in this dry area and give food, even in times of need.
There are 250,000 known plant species in the world, but only 20 of them provide 90% of our food so the Eden Foundation grow underexploited, edible trees and bushes to feed the local people.
Since their arrival, Eden has served more than 2500 households in the region.
The seeds are free and they show the local people how to grow the seed.
They also give health advice.

18. Eden Foundation
"Thanks to our Eden trees, we've had food to eat even though the millet failed. For the last three years, we haven't had a single good rain in our village and this year's harvest lasted less than a month. Instead, my family has lived from the Eden fruits on our field which gives us food for the day. We depend on it, for there is nothing else to eat around here." - Musa Abari from Garin Farara

19. Problems?
Civil wars, as in Ethiopia and Sudan prevent aid reaching stricken areas and cause mass migration to refugee camps.
Population growth continues to outstrip food supplies.