Balancing the needs of Business Development and Nature Conservation The Tees is one to the North Sea's principal estuaries. With its port , industry an large population it is of major significance to the United Kingdom's economy. It is also internationally important for its bird population and is significant for its wildlife habitats and other animals including seals. One of the challenges in Tees Valley is balancing the needs of economic development and nature conservation. Over almost 30 years of existence INCA has a proven record of delivering benefits for both industry and the natural environment.