Pollution
Pollution is the introduction of contaminants into the natural environment that cause adverse change. [1] Pollution can take the form of chemical substances or energy , such as noise, heat or light. Pollutants , the components of pollution, can be either foreign substances/energies or naturally occurring contaminants. Pollution is often classed as point source or nonpoint source pollution . In 2015, pollution killed 9 million people in the world. Major forms of pollution include: Air pollution , light pollution , littering , noise pollution , plastic pollution , soil contamination , radioactive contamination , thermal pollution , visual pollution , water pollution . Water Pollution Water pollution is the contamination of water bodies , usually as a result of human activities. Water bodies include for example lakes , rivers , oceans , aquifers and groundwater . Water pollution results when contaminants are introduced in