Sagar V. Krupa

TL;DR: Current information suggests that a critical load of 5-10 kg ha (-1) year(-1) of total N deposition (both dry and wet deposition combined of all atmospheric N species) would protect the most vulnerable terrestrial ecosystems (heaths, bogs, cryptogams) and values of 10-20 kg ha-1 year-1 would protect forests, depending on soil conditions.

TL;DR: Experiments on root and rhizosphere response in plants grown in CO(2)-enriched atmospheres will be reviewed and, where possible, collectively integrated, to offer a series of hypotheses which are considered as priority targets for future research.

TL;DR: The importance of tropospheric O(3) within the chemical climatology of the authors' environment and its effects on vegetation is re-emphasized, with the fact that plant health is the product of its interaction with the physical and chemical Climatology and pathogens and pests.

TL;DR: The effects of UV-B, CO2 and O3 on plants have been studied under growth chamber, greenhouse and field conditions, and few studies, if any, have examined the joint effects of more than one variable on plant response.

TL;DR: It is concluded that current and projected levels of O3 in many regions worldwide are toxic to sensitive plants of agricultural and horticultural significance, while reductions in O3 precursor emissions will likely benefit world food production and reduce atmospheric concentrations of an important greenhouse gas.