Excessive irrigation can affect water quality by causing <em>erosion</em>, <u>transporting nutrients</u>, <u>pesticides</u>, and <u>heavy metals</u>, or <u>decreasing the amount of water that flows naturally</u> in streams and rivers.
Soil erosion due to land clearance and grazing. contaminated soils due to <u>pesticides</u> or <u>overuse of fertilizers</u>.
Air emissions from livestock operations make up 1<u>4.5 percent of global greenhouse gas</u>. Livestock farming emits several <u>greenhouse gases </u>that contribute to <u>climate change</u>, and may also be subject to the effects of <u>climate change</u> due to increased animal stress in dealing with rising temperatures.
