Göran is doing research on the effects of climate and air pollutants on plant ecosystems. He is conducting studies on the interaction between vegetation, soil and atmosphere. The main topic is exchange of carbon and water between these systems that are investigated by using gas exchange techniques, biomass measurements, elementary analysis, and carbohydrate analysis. The focus is on boreal coniferous forests, but studies are also made on agricultural corps, deciduous trees as well as forests in the tropics. The main objectives are how the exchange of carbon dioxide is i) effected by climate and air pollutants; ii) can be up-scaled from leaf and shoots to tree and ecosystem levels.