The images illustrate how pollutants produced by modern human activities are transformed into acid rain and how this process negatively affects the environment and the food chain.
Overall, the process begins with pollutants released by human activities and ends with acid rain contaminating natural ecosystems and entering the food chain.
At the first stage, pollutants are released into the air from modern human activities such as housing, transport, factories and power stations. These harmful gases, including carbon dioxide, sulphur dioxide and nitrogen oxides, rise into the atmosphere and combine with clouds. As a result, polluted clouds are formed and can be carried over long distances by the wind.
In the next stage, acid rain falls from the polluted clouds onto hills, fields, rivers and lakes. This rain damages trees and plants and also contaminates water sources. Eventually, the pollutants enter the food chain through plants, animals and water, causing serious harm to the environment.