conventional agricultural practices. Agriculture is the process of producing food, feeding products, fiber and other desired products by the cultivation of certain plants and the raising of domesticated animals (livestock). On average, 83% of the food consumed by humans is produced using terrestrial agriculture. Other food sources include aquaculture and fishing. Scientists, inventors, and others devoted to improving farming methods and implements are also said to be engaged in agriculture. One in three people worldwide are employed in agriculture, yet it only contributes 3% to global GDP. In 2017, on average, agriculture contributes 4% of national GDPs. Global agricultural production is responsible for between 14 and 28% of global greenhouse gas emissions, making it one of the largest contributors to global warming, in large part due to conventional agricultural practices, including nitrogen fertilizers and poor land management. Agronomy is the science and technology of producing and using plants for food, fuel, fibre, and land reclamation. Agronomy encompasses work in the areas of plant genetics, plant physiology, meteorology, and soil science. Agronomy is the application of a combination of sciences. Agronomists today are involved with many issues including producing food, creating healthier food, managing the environmental impact of agriculture, and extracting energy from plants. Food processing Food processing includes the methods and techniques used to transform raw ingredients into food for human consumption. Food processing takes clean, harvested or slaughtered and butchered components and uses them to produce marketable food products. There are several different ways in which food can be produced. One-off production: This method is used when customers make an order for something to be made to their own specifications, for example, a wedding cake. The making of one-off products could take days depending on how intricate the design is. Batch production: This method is used when the size of the market for a product is not clear, and where there is a range within a product line. A certain number of the same goods will be produced to make up a batch or run, for example a bakery may bake a limited number of cupcakes. This method involves estimating consumer demand. Mass production: This method is used when there is a mass market for a large number of identical products, for example chocolate bars, ready meals and canned food. The product passes from one stage of production to another along a production line. Just-in-time (JIT) (production): This method