The United Republic of Tanzania has made progress in a range of areas that are part of the Warsaw Framework for REDD+, or the so-called "REDD+ Rulebook". The valuation of the country's forest ecosystems and their contribution to its economy was one of the activities that continued after its national programme closed in 2013 as part of the UN-REDD support for national actions. Approximately 38 per cent of the country's mainland is set aside in protected areas for conservation.