Agriculture is an important economic activity. It includes growingcrops and rearing animals. Agriculture produces a wide range ofproducts for manufacturing industries as well as food. Unlike manufacturing and services, agriculture relies heavily on the pollution of the environment, especially climate, and the life cycles of plant and animals. Both are largely outside the control of farmers. Agriculture also uses a larger proportion of the Earth's surface (about 37 per cent of the land area) and provides more employment world wide than any other economic activity.