In 2008, a document ("Shifting Shores - Living with a changing coastline") produced by the National Trust highlighted that the increase in coastal erosion could affect 279 km (173miles) of the Trusts coastline in the south west and tidal flooding could affect 852 hectares (2105 acres). It also highlighted their Management Policy which was "working with natural processes wherever possible", and allowing the coast to realign itself when sea defences have to be removed. When assessing different management options a number of social, economic and environmental factors must be considered.