There are about five billion hectares of arable land worldwide. Natural factors mean that less tahn a third of this land is suitable for growing grains, maize, vegetables, potatoes, rice etc. The rest is meadows, pastures, steppes or the Alps. This is also the case in Switzerland.
The plants growing in these areas cannot be used by humans directly. However, cows, goats, sheep and other animals that consume roughage can eat this plant material and produce food products such as milk and meat, as well as other useful products such as wool and leather. In this way, pasture farming produces high-quality foodstuffs from areas that couldn't otherwise be used for the production of food. This is also the case in Switzerland.