Map of usa
A black and white graphic outlines the shape of the usa.
Concepts
One inch of water in soil
A graphic of brown soil layers with 1 inch of water at the top represented by a blue layer.
One inch of water dilutes soil
A graphic of brown and blue soil shows 6 inches of soil diluted with water.
Farmers around the world
A black and white sketch of the earth with three enlarged farmers on different continents on the earth.
Economic decline
Five bars descend from tall to short and green to red with a dollar symbol hovering above it to represent
Aeroponic system sketch
A sketch of an aeroponic system shows three plants having their roots sprayed by a fine mist of water and