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Water is a natural resource without which there would be no life on earth. Clean groundwater is produced over a long period of time and therefore needs to be used sustainably. Human activity affects both the cleanliness and availability of fresh water. Water quality may, for example, be affected by chemical residues from sewage treatment plants and arable land. In the course of production and other activities, pollution of water bodies, surface water and groundwater must be avoided so that clean water remains available. Water statistics show how much water is consumed in Estonia; how many

What might happen to Estonia's population in the next few decade and what will be the percentage of children, young people, working- and retirement-aged people in the population? Population projections show how the composition of the population is likely to change in a certain time span. When preparing population projections, current trends in births, deaths and migration are extended to the future. However, many variables need to be taken into account, such as the number of children and the age of mothers, mortality in different age groups, the age distribution of the migrating population and