Atmosphere composition changes, solar irradiance variations, and changing forest tree growth

The paper deals with changes in the Earth's atmosphere composition, which greatly influence the growth and health condition of forests. Impacts of increasing concentrations of greenhouse gases and anthropogenic aerosols on future climate changes are assessed. In the past forty years increasing assimilation of CO2 by forests growing in temperature and boreal zones in the Northern Hemisphere was observed. Increasing trends in diameter, height and volume growth of forest trees were found in the Central, Western and Northern Europe. Causes of higher increments are not exactly known, however, the results of present measurements indicate that higher air temperature, nitrogen deposition in forest soils and raising atmospheric CO2 concentration participated in increased growth of forests