How does farming affect water, land, and air?

Excessive irrigation can affect water quality by causing erosion, transporting nutrients, pesticides, and heavy metals, or decreasing the amount of water that flows naturally in streams and rivers.Soil erosion due to land clearance and grazing. contaminated soils due to pesticides or overuse of fertilizers. Air emissions from livestock operations make up 14.5 percent of global greenhouse gas. Livestock farming emits several greenhouse gases that contribute to climate change, and may also be subject to the effects of climate change due to increased animal stress in dealing with rising temperatures.