This area includes mountain pastures that are expected to undergo significant changes in the accumulation of carbon if there is no change in land use. It is the optimal zone for capture and accumulation of carbon from forests and other vegetation. Forecasts of the realistic scenario in 2050 increase the range of Zone A, as it incorporates parts of the Danube valley, parts of the Upper Valley of Tundzha hilly plain and the Struma valley and parts of die Black Sea coast and Dobrudzha.