Question

Why are environmental issues a major concern for the people of Sub-Saharan Africa?

They derive most of their livelihoods from the land.
They import almost all of their food.
They produce almost all of the world's oil.
Tourism is declining.

Answer 1

SOS:

The answer is they derive most of their livelihoods!!

Hope this helps!!

Answer 2

The answer is that they derive  most of their livelihoods from the land.