Оператор i:=i+1 i:=i+1; заменяет значение i на i + 1, т. е. увеличивает значение переменной i на 1.

One of the most important issues of our time - the environment.People, their activities, strongly interfere with natural processes, so lately we often recall the problems related to the environment and safety of life on planet Earth.What environmental problems, I think the most important?1. depleted soil, growing pollution chemicals (land - is the main supplier of food for humans and most animals);2. air pollution due to emissions of motor vehicles and industrial plants;3 people destroy about half of forests, and the millions of hectares (forest is a source of oxygen);4. catastrophically rapid decline of species on earth, due to the destruction of their living environment (mining, logging, construction of buildings and highways);5. abrupt warming may cause the disappearance of some species of animals and plants;6. The world's population is growing steadily;Careless human activity leads the dire consequences, namely the risk of environmental degradation.There is a need to engage in the production of more efficient and environmentally friendly technologies.Much depends on each of us.