On the edge of the Kalahari Desert in Namibia, sand dunes are encroaching onto once-fertile lands in the north. Healthy vegetation appears red in this image; in the center, notice the lone red dot. It is the result of a center-pivot irrigation system, evidence that at least one optimistic farmer continues to work the fields despite the approaching sand.

Image: 
IG Type: 
Source: 
Landsat 7
JPG name: 
OPTIMIST
TIF name: 
OPTIMIST
Scale: 
1.4 miles (2.2km)