Hence, targets aiming at reducing the use of specific resources in the economy could be set and monitored, as could targets relating to the flows of materials and energy that leaves the economy (residuals) including solid waste, waste water and emissions to air, water and soils. It does not monitor the trends in the status of specific species. While it may be used to monitor trends in the use of certain assets over time, it can't be used to monitor the stock of different types of ecosystems as these are not recorded in the SEEA.