About 90 percent of the population earns their living from the land, mainly as subsistence farmers. Agriculture is the backbone of the national economy and the principal exports from this sector are coffee, oil seeds, pulses, flowers, vegetables, sugar and foodstuffs for animals. There is also a thriving livestock sector, exporting cattle on the hoof and hides and skins. Mineral exploration has stepped up in recent years – there are reserves of oil, natural gas, coal, gold, copper, tantalum, potash, zinc, iron ore, nickel, marble, precious and semi-precious stones. Thermal power generation schemes are already operational in Afar and Oromo Regions.