Other areas of legal reform included biodiversity and wildlife protection, strategic environmental assessment (SEA), and air, waste and water management. The main government agencies dealing with the environment - the Department of the Environment, Heritage and Local Government (DoEHLG) and the Environmental Protection Agency (EPA) - enlarged their portfolios and staffing. The Environmental Enforcement Network, established in 2003, provides a mechanism for concentrating resources and promoting co-ordination and coherence across administrative divisions. Economic instruments have been introduced, especially in the waste sector.