Question

Which of the following would be the most effective long-term solution to fighting desertification in the Sahel?

a. planting trees throughout the Sahel
b. constructing walls around villages to act as barriers against approaching sands
c. dropping loads of water over large areas of the Sahel
d. using plows to remove sands from inhabited locations

Answer 1

"b. constructing walls around villages to act as barriers against approaching sands" would be the best long-term solution, since planting trees without this measure would only be a temporary fix.