More needs to be done to exploit satellite images to monitor changes in land cover. Wetlands are highly valued habitats for biodiversity and their loss is of international significance. The area of other types of semi-natural agricultural habitats (farm woodland and fallow land) has increased or remained stable. Farmland has mainly been converted to use for forestry and urban development. Despite this overall trend, agriculture remains the major land use for many countries, representing over 40% of the land area in two-thirds of OECD countries.