by European standards, producing about 60% of food needs with only 1% of the labour force. It contributes around 2% of GDP. Around two thirds of production is devoted to livestock, one third to arable crops. In 1993, it was estimated that land use was: Arable land: 25% Permanent crops: 0% Permanent pastures: 46% Forests and Woodland: 10% Other: 19% Irrigated: 1,080 km2 The UK has a variety of natural resources including: Geological: coal, petroleum, natural gas, limestone, chalk, gypsum, silica, rock salt, china clay, iron ore, tin, silver, gold, lead. Agricultural: arable land, wheat, barley, sheep The UK has large coal, natural gas, and oil reserves; primary energy production accounts for 10% of GDP, one of the highest shares of any industrial nation. Due to the island location of the UK, the country has great potential for generating electricity from wave power and tidal power, although these have not yet been exploited on a commercial basis. Environment Current issues England is one of the most densely populated countries/regions in the world, and the most densely populated major nation in Europe. The high population density (especially in the southeast of England) coupled with a changing climate, is likely to put extreme pressure on the United Kingdom's water resources in the future. The United Kingdom is reducing greenhouse gas emissions. It has met Kyoto Protocol target of a 12.5% reduction from 1990 levels and intends to meet the legally binding target of a 20% cut in emissions by 2010. By 2015, to recycle or compost at least 33% of household waste. Between 1998-99 and 1999–2000, household recycling increased from 8.8% to 10.3% respectively. According to a 2018 survey for the World Wide Fund for Nature, the United Kingdom is one of the most nature-depleted countries in the world, coming in 189th place out of 218 countries. International agreements The United Kingdom is a party to many international agreements, including: Air Pollution, Air Pollution-Nitrogen Oxides, Air Pollution-Sulphur 94, Air Pollution-Volatile Organic Compounds, Antarctic-Environmental Protocol, Antarctic-Marine Living Resources, Antarctic Seals, Antarctic Treaty, Biodiversity, Climate Change, Climate Change-Kyoto Protocol, Desertification, Endangered Species, Environmental Modification, Hazardous Wastes, Law of the Sea, Marine Dumping, Marine Life Conservation, Nuclear Test Ban, Ozone Layer Protection, Ship Pollution, Tropical Timber 83, Tropical Timber 94, Wetlands and Whaling. The UK has signed, but not ratified, the international agreement on Air Pollution-Persistent Organic Pollutants. Geography of dependent territories Crown dependencies Geography