Industrial plantations are established to produce a high volume of wood in a short period of time. Plantations are grown by state forestry authorities (for example, the Forestry Commission in Britain) and/or the paper and wood industries and other private landowners (such as Weyerhaeuser, Rayonier and Plum Creek Timber in the United States, Asia Pulp & Paper (APP) in Indonesia). Christmas trees are often grown on plantations as well. In southern and southeastern Asia, teak plantations have recently replaced the natural forest. Industrial plantations are actively managed for the commercial production of forest products. Industrial plantations are usually large-scale. Individual blocks are usually even-aged and often consist of just one or two species. These species can be exotic or indigenous. The plants used for the plantation are often genetically altered for desired traits such as growth and resistance to pests and diseases in general and specific traits, for example in the case of timber species, volumic wood production and stem straightness. Forest genetic resources are the basis for genetic alteration. Selected individuals grown in seed orchards are a good source for seeds to develop adequate planting material. Wood production on a tree plantation is generally higher than that of natural forests. While forests managed for wood production commonly yield between 1 and 3 cubic meters per hectare per year, plantations of fast-growing species commonly yield between 20 and 30 cubic meters or more per hectare annually; a Grand Fir plantation at Craigvi ean in Scotland has a growth rate of 34 cubic meters per hectare per year (Aldhous & Low 1974), and Monterey Pine plantations in southern Australia can yield up to 40 cubic meters per hectare per year (Everard & Fourt 1974). In 2000, while plantations accounted for 5% of global forest, it is estimated that they supplied about 35% of the world's roundwood. The Forestry Commission is a non-ministerial government department responsible for forestry in Great Britain. It was set up in 1919 to expand Britain's forests and woodland after depletion during the First World War. To do this the commission bought large amounts of former agricultural land, eventually becoming the largest land owner in Britain. The Commission is divided in to three national organisations; Forestry Commission Scotland and Forestry Commission Wales report to the relevant devolved authorities. Over time the purpose of the Commission broadened to include many other activities beyond timber production. One major activity is scientific research, some of which is carried out in research forests across Britain. Recreation is also important, with several outdoor activities being actively promoted. Protecting and improving biodiversity across Britain's forests are both part of the Forestry Commission's remit. The Commission received criticism for its reliance on conifers, particularly the uniform appearance of conifer forests and concerns over a lack of biodiversity. Protests from the general public and conservation groups accompanied attempts to privatise the organisation in 1993 and 2010.