Agriculture

Agriculture is the artificial cultivation and processing of animals, plants, fungi and other life forms for food,fibers and other byproducts.^[1] Agriculture was the key implement in the rise of sedentary humancivilization, whereby farming of domesticated species created food surpluses that nurtured the development of much denser and more stratified societies. The study of agriculture is known as agricultural science. Agriculture is also observed in certain species of ant and termite.^[2][3]

The history of agriculture dates back thousands of years, and its development has been driven and defined by greatly different climates, cultures, and technologies. However, all farming generally relies on techniques to expand and maintain the lands suitable for raising domesticated species. For plants, this usually requires some form of irrigation, although there are methods of dryland farming; pastoral herding onrangeland is still the most common means of raising livestock. In the developed world, industrial agriculturebased on large-scale monoculture has become the dominant system of modern farming, although there is growing support for sustainable agriculture (e.g. permaculture or organic agriculture).

Modern agronomy, plant breeding, pesticides and fertilizers, and technological improvements have sharply increased yields from cultivation, but at the same time have caused widespread ecological damage and negative human health effects.^[4] Selective breeding and modern practices in animal husbandry such asintensive pig farming have similarly increased the output of meat, but have raised concerns about animal cruelty and the health effects of the antibiotics, growth hormones, and other chemicals commonly used in industrial meat production.^[5]

The major agricultural products can be broadly grouped into foods, fibers, fuels, and raw materials. In the 21st century, plants have been used to grow biofuels, biopharmaceuticals, bioplastics,^[6] and pharmaceuticals.^[7] Specific foods include cereals, vegetables, fruits, and meat. Fibers include cotton, wool,hemp, silk and flax. Raw materials include lumber and bamboo. Other useful materials are produced by plants, such as resins. Biofuels include methane from biomass, ethanol, and biodiesel. Cut flowers, nursery plants, tropical fish and birds for the pet trade are some of the ornamental products.

In 2007, one third of the world's workers were employed in agriculture. The services sector has overtaken agriculture as the economic sector employing the most people worldwide.^[8] Despite the size of its workforce, agricultural production accounts for less than five percent of the gross world product (an aggregate of all gross domestic products).