FACE circles have been used across in parts of the United States in
temperate forests and also in stands of
aspen in
Italy. The method is also utilized for agricultural research. For example, FACE circles have been used to measure the response of
soybean plants to increased levels of
ozone and carbon dioxide at research facilities at the
University of Illinois at Urbana–Champaign. FACE technologies have yet to be implemented in
old growth forests, or key biomes for
carbon sequestration, such as
tropical forests, or
boreal forests and identifying future research priorities for these regions is considered an urgent concern. Examples of this method being used globally include TasFACE, which is investigating the effects of elevated CO2 on a native
grassland in
Tasmania,
Australia. The National Wheat FACE array is presently being established in Horsham, Victoria, Australia as a joint project of the Victorian Department of Primary Industries and the University of Melbourne. EucFACE is Australia's only forest FACE experiment, and was established by the
University of Western Sydney in
Cumberland Plain Woodland dominated by
Eucalyptus tereticornis near
Richmond, New South Wales in 2012. A FACE experiment began at
Duke University in June 1994. The Blackwood Division of the
Duke Forest contains the Forest-Atmosphere Carbon Transfer and Storage facility. This consists of four free-air enrichment plots which provide higher levels of atmospheric concentration and four plots that provide ambient control. There have been 253
publications reporting on the findings of the experiment. ==Results==