The extent of sand dunes has fallen by 40% this century, mainly in along the western shores of Europe; a third of the loss has occurred since mid 1970s.
Útbreiðsla sandaida hefur dregist saman um 40% á þessari old, einkum meðfram vestursüönd Evrópu; einn ¡irirtji samdráttarins atti sér start um mirtjan áttunda áratuginn.