Before revision: However, the history of the word "pollution" , and pollution's effect over time, reveals the fact that every "Pollution" can be categorised and studied in its three main characteristics, namely Contextual, Subjective and Complex.
After revision: However, the history of the word pollution , and pollution's effect over time, reveals the fact that every form of pollution can be categorised and studied in its three main characteristics, namely Contextual, Subjective and Complex.