Pollution is the introduction of contaminants into the natural environment that cause adverse change.

Pollutants, the components of pollution, can be either foreign substances/energies or naturally occurring contaminants.

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