Special issues Climate of the past 2000 years: global and regional syntheses 7418 Climate change in the Balkan-Carpathian region during Late Pleistocene and Holocene 7040 PAST Gateways (Palaeo-Arctic Spatial and Temporal Gateways) 7121 Tambora and the "Year Without a Summer" of 1816 7005 Understanding Change in the Ecological Character of Internationally Important Wetlands 6982