Coordinated international actions to protect the stratospheric ozone layer were implemented after the 1988 Vienna Convention and the 1989 Montreal Protocol. Both instruments are considered a model approach to effective cooperation in combating environmental threats at the global level. The projections indicate that the regeneration of the ozone layer would occur at the turn of the 20th and 21st century. Now it appears that the regeneration process may be delayed by several years as the atmospheric ozone depletion has not been stopped, although its rate has been greatly decreased. The author discusses the reasons underlying this phenomenon.
Mistakes made during meadow management, especially a lack of crop cultivation and reducing of mineral fertilization are the reasons for simplification and often degradation of species composition on meadow sward. It is not only the cause of yield decrease but also sod looseness and as a consequence, soil habitat degradation. Various reseeding techniques are the means for its improvement. In our study carried out on smooth-stalked meadow situated on peat-rot soil, the best results were obtained for objects pre-sown after cultivation in the traditional way, i.e. using rototiller. On the objects that were oversown using special sowing machines (slotted or groove types), good results were obtained after strong weakening the competitiveness of the old sward using Roundup spraying. In high humidity conditions, Reglone spraying or the lack of it caused fast regeneration of Poa pratensis var. angustifolia that made impossible to develop the oversown species.