Four human impacts on the lithosphere brought on through agriculture are: 1. Increased salinity of the surrounding environment due to pesticide and fertilizer use. 2. Increased soil erosion due to the destruction of the native, protective canopy. 3. Decreased soil productivity due to the overuse of land. 4. Increased pollutants in the groundwater table due to chemical use and/or lower levels of the water table to irrigation and then runoff or evaporation.