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Plastic pollution over the Indian Ocean. (TV: Praxeus)

Pollution was the contamination of the environment by harmful substances, usually caused by industrial activity.

Earth's Industrial Revolution prompted the pollution of the planet by humanity. Chemical and industrial waste had a detrimental effect on the air and the rivers. (TV: Invasion of the Dinosaurs)

In the 1970s, a rise in ecological consciousness produced several anti-pollution activists. Clifford Jones protested the opening of the Global Chemicals oil refinery in Llanfairfach, which was later found to be dumping lethal toxic waste into the abandoned coal mine and was shut down. (TV: The Green Death) Sir Charles Grover formed Operation Golden Age to return Earth to its pre-industrial state. (TV: Invasion of the Dinosaurs) Professor J. P. Kettlewell developed pollution-free technologies such as a solar battery and a metal virus that would break down metal waste into easily recyclable form. (TV: Robot) Australia was known to a computer at this time as the country's life-support systems were in danger of collapse due to pollution. (TV: Dr. Who For Keep Australia Beautiful)

Sarah Jane Smith watches a video about the harmful effects of pollution in the reminder room. (TV: Invasion of the Dinosaurs)

In the early 21st century, industrial pollution was so severe that the planet was reaching the point of no return. The Butler Institute planned to save humanity from the environmental collapse by uploading copies of their minds into computers. The Seventh Doctor and Ace put a stop to this, forcing the world's business corporations to instead fund a massive environmental clean-up program. (PROSE: Cat's Cradle: Warhead)

By 2050, pollution had made Britain on average three degrees warmer that it had been in the Middle Ages, and all the oak trees and birches had been cut down or died out. (TV: The Last Oak Tree) That year, Inspector Drake polluted the River Thames with chenium, but this was cleaned up by the Medes. (TV: Alien Avatar)

In 2137, the corporations successfully lobbied for the repeal of anti‐​pollution laws. (PROSE: Lucifer Rising)

In the 25th century, Earth was heavily polluted. (TV: Colony in Space)

By the 26th century, the oceans had been polluted, irradiated, set on fire and boiled off into a thick sludge. (PROSE: Ship of Fools)

In the 30th century, Earth was heavily polluted, with most of the population living in Overcities. (TV: The Mutants, PROSE: Original Sin)

In the 52nd century, Earth no longer had winters, due to pollution. (PROSE: The Frozen)

In the year 500000, Earth was so polluted that its surface was just a chemical slime. (TV: The Curse of Fenric)

In the far future, the planet Endpoint was heavily polluted due to being used as a waste dumping ground by the inhabitants of its system. (PROSE: Hope)