Case Study → Contribution of Human Activity, Increasing Risk of Drought, Sahel Region Simplified Revision Notes for A-Level Edexcel Geography

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Case Study → Contribution of Human Activity, Increasing Risk of Drought, Sahel Region

Context	● Semi-arid area South of the Sahara Desert has always been prone to droughts ○ Since 1960s been a sig ↓ in rainfall
Physical (possibility)	● ENSO cycles ● Variability ○ Seasonally approx 85% of annual rainfall in summer ○ Changes on an annual basis
Human Causes	🔗 Humans do not cause the drought but they act like a positive feedback loop, enhancing its impacts ● Air pollution from Europe and N America cooled the Earth, preventing tropical rains moving Northwards ● Higher sea temps (from global warming) prevented moist Atlantic air moving over W Sahel ● Desertification has resulted from overuse of land due to population pressures

                                                                      The Sahel Drought *

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Topic 5: The Water Cycle & Water Insecurity

The Global Hydrological Cycle is of Enormous Importance to Life on Earth