Land use comparison map

This map I made shows the cumulative areas of various human industries in the USA (agricultural, mining, cities, roads) for comparison. Most crazy to me is that we use about 37,000mi^2 (about the size of Indiana) of cropland to grow corn to produce ethanol fuel. This process is extremely inefficient in terms of chemical energy out over sunlight in because it only uses the corn kernels themselves and Zea mays is not a particularly efficient photosynthesizer. It would be much better if a more efficient energy crop replaced this.