Pollution is the introduction of contaminants into the natural environment that causes adverse change. Pollution can take the form of chemical substances or energy, such as noise, heat or light. Pollutants, the components of pollution, can be 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.

Io (2019) Review
To boring to hate Io (2019): 3 out of 10: Pollution renders Earth virtually uninhabitable as the remaining population flees to Jupiter’s Moon Io. One […]