is a high risk in agriculture because of seasonal uncertainty. Rice growing will fail if the rainy season ends before its time, and tobacco growing will fail if rain comes early. Bojonegoro is one of the biggest producers of tobacco in Indonesia, with a total value of Rp1.2 trillion (around US$100 million) and employing 57 percent of workforce. The majority of tobacco planted is Virginia varieties. However, Bojonegoro tobacco suffers from a high proportion of chlorine, and uncertain rainfall. Most tobacco is used to make clove cigarettes (kretek). Forestry Bojonegoro is also known for its hardwood tree (teak) production. There is an annual Bojonegoro Teak Fair in late January to early February where local craftsmen display their products. Teak is mainly used in shipbuilding and furniture making. A teak cutter is called in the local Javanese dialect. Teak forestry faces a major problem in illegal logging, as with other parts of Indonesia. In 2001 alone, the area looted covered 3,000 ha; looters stole an estimated 27,000 trees. The regional police reported impounding 550 large trucks of stolen timber, approximately 2,000 m3, with an estimated local market value of US$1,000,000. Several riots have happened when tension arise from teak claims and when police tried to enforce the law on local thieves. These riots were the worst during the period of turmoil between president Abdurrahman Wahid and Megawati Sukarnoputri in 2001. However, after that situation calmed, enforcement became better, but illegal logging is still a significant problem, with police and bureaucratic officials often accused of cooperating with timber thieves. Petroleum and gas The recent discovery of oil and gas fields in the area is providing new economic opportunities. The oil/gas fields locations include Banyu Urip, Alas Dara, Alas Tua West, Alas Tua East, Jambaran, Cendana (ExxonMobil 45%, Pertamina 45%, local companies 10% - under Joint Operating Agreement) and Sukowati (Operated under Joint Operating Body - Petrochina Pertamina East Java). The Banyu Urip oil and gas field has proven oil reserves of over , with peak production of about per day, accounting for 20 percent of the present national crude oil production. The main exploration started officially when a cooperative contract signed on September 17, 2005, with Mobil Cepu Ltd., a subsidiary of ExxonMobil as main operator. A joint operation agreement between state oil company Pertamina was signed in March 2006. Pertamina and ExxonMobil concluded a 30-year production-sharing contract in which each company