标题：Preface to the Special Issue "Integrated Monitoring in the Valkea-Kotinen Catchment during 1990–2009: Abiotic and Biotic Responses to Changes in Air Pollution and Climate"
摘要：Increased emissions of air pollutants and greenhouse gases into the atmosphere have caused severe environmental problems at local and global scales. The long-range transport of sulphur and nitrogen oxides resulted in widespread acidification of acid-sensitive aquatic ecosystems in Europe and North America in the late 1900s (e.g. Rodhe et al. 1995). Airborne contamination of trace metals and persistent organic pollutants also reached the most remote regions of the world (e.g. AMAP 1998). At the same time, emissions of greenhouse gases into the atmosphere are causing global warming, and consequent climate change is considered to be among the most severe threats to the ecosystems (e.g. Rosenzweig et al. 2007).
