While the environmentalists get anxiety about trendy theoretical things like climate change, which is something deduced largely from computer models that run “hot,” real environmental concerns that impact upon agriculture often are downgraded or ignored. Soil erosion is a big issue, as is the problem of salt. It seems that human activities are making the soil and freshwater saltier. The main activities doing this are mining and land development. The natural salt cycles are being disrupted, and their effects upon drinking water is to diminished quality, especially for animals on farms. Human-caused salinization affected approximately 2.5 billion acres of soil around the world, affecting productivity. It is difficult to remove salt from soils once it is there.