OUR ENVIRONMENT - THREATS AND PROTECTION....continued

Exemplifying dangers to the environment typical of Central Europe and methods of conservation practiced, this series of transparencies shall help the teacher to introduce universal valid and acute fundamentals of ecology and protection of the environment. Not only in Europe, but all over the world, mechanization of all areas of life and its consequences change the structure of nature, destroy our environment, and finally endanger the basis of our life. The newly curricula of all types of schools provide instruction of the subject complex "Environment - threats to environment - protection of environment". This series transparencies offers visual aids to improve this instruction. Typical examples show which processes are changing the natural structure of our environment and how the dangers arising from this can be counteracted.

I. The Landscape - Old type of land developed and cultivated by humans in Central Europe (colour photo) - Monoculture (colour photo) - Culture steppe (colour photo) - Woodland (colour photo) - Healthy trees (colour photo) - Sick forest (colour photo) - Distinctive marks of damaged trees (colour photo) - Stages of damaged tree - Natural course of a running water (colour photo) - Straightened course of a running water (colour photo) - Recultivation of a closed waste disposal site, general view (colour photo) - Ditto. diagram of transection - Stag heap (colour photo) - Incorporation of stag heap into the landscape (colour photo) - Nature reserves (colour photo) - Water reservation (colour photo) - Drinking water dams (colour photo) - Animals extinct or in danger of extinction in the 20th century, selection (table) - Heavily endangered animals, selection (table) - Plants extinct or in danger of extinction in the 20th century, selection (table) - Heavily endangered plants, selection (table).

II. Soil and Water - Average number of small animals in the top layer of meadows, pastures, and forests (table) - Unsightly open dumping (colour photo) - Controlled waste disposal site, general view of site (colour photo) - Controlled waste disposal site, detail view (colour photo) - Controlled waste disposal site (diagram of structure) - Compostable and non-compostable components of waste (graph) - Composting of waste (diagram) - Wild burning of waste in the open country (colour photo) - Incinerating plant, function (diagram) - Introduction of sewage into a flowing water (colour photo) - Change of oxygen content of a flowing water caused by introduction of sewage (graph) - Full biological sewage plant (diagram) - Primary, mechanical treatment in a sewage plant: grit, sand catch (colour photo) - Primary, mechanical treatment in a sewage plant: primary sludge basin (colour photo) - Mechanical treatment in a sewage plant: function (diagram) - Biological treatment in a sewage plant: activated sludge basin (colour photo) - Ditto: activated sludge basin (colour photo) - Ditto: function of activated sludge (diagram) - Ditto: organisms of the activated sludge (drawing) - Ditto: drip towers (colour photo) - Ditto: drip towers, function (diagram) - Basin for secondary clarification (colour photo) - Chemical clarification of sewage (graph) - Causes for salting of surface- and ground water (graph) - Dangerous concentrations of harmful substances in the water (table) - Chemical pest control (colour photo) - Biological chain of pesticides (graph) - Biological pest control, pests and their natural enemies, selection - Biological pest control by plants (table) - Contamination of the environment with heavy metals (graph) - Accumulation of poisonous heavy metals in the food chain (graph).

III. The Air - Structure of the terrestrial atmosphere - Importance of the ozone layer (diagram) - Exposure to natural and human-made radiation (table) - Half-life of radioactive isotopes (table) - Main storage organs for radioactive isotopes (table) - Various radiations (table) - Sensitivity to radiation (table) - Types of smog (table) - Development of smog (diagram) - Effect of smog on humans (graph) - Consumption of air and oxygen by humans and motor vehicles (table) - Dangerous substances in exhausts from combustion motors (table) - Fluctuation of CO-concentration in the air of a main thoroughfare (graph) - Effect of CO on humans (table) - Plants damaged by polluted air (colour photo) - Buildings damaged by polluted air (colour photo) - Lichens indicate air pollution (colour photo) - Harmful substances in tobacco smoke and their effect on humans (table) - Mortality by lung cancer of cigarette-smokers and non-smokers (graph) - Power of various noises (graph) - Noise map of a big town (graph) - Effect of noise on humans (table).