Global warming

Global warming was enviromental damage that resulted in planets becoming hotter.

Global warming on Earth
Earth was a notable victim of global warming.

Compared to the 21st century, Britain was on average three degrees colder in the Middle Ages. (K9TV: The Last Oak Tree) A device called the Sun Shield was designed in the 2000s to partially block off the sun, to stall the effects of global warming. (DWS: Sunscreen)

In 2007, Professor Mallingan and his team of scientists began draining the power of the icy planet of Asharoth hoping that it would put an end to global warming on Earth. The Tenth Doctor came across Mallingan's plans and enlisted the help of one of his scientists to destroy his lab, saving Asharoth. (DWA: Cold War)

Global warming was also a problem in Pete's World. Mass dimensional travel into Normal Space by the Cybermen resulting in temperatures rising, by 2010 the ice caps were melting. (DW: Doomsday)

When she visited the time of the Second Great and Bountiful Human Empire with the Tenth Doctor, 21st century native Donna Noble was fascinated that Earth is still populated, despite all the news articles stating the near end of the world, including global warming and the disappearance of bees. (DW: Planet of the Ood)

Agriculture was harmed by severe climate change, starting in 2040 with horrific storm conditions. New ways of growing food were developed. (DW: The Waters of Mars)

Sometime before the 2050, a group of scienstists created a device to cool the Earth, but it was misused, (K9TV: The Korven) resulting in the Great Cataclysm. (K9TV: Aeolian)

Rising sea levels caused by global warming flooded the Netherlands, forcing the Dutch people to become refugees. Later in the century they founded a new homeland on an island in the Atlantic Ocean, which they named the New Dutch Republic. (NA: St Anthony's Fire)

By 2099, the governments of Earth, in answer to global warming, had taken vast sections of the Arctic and Antarctic and placed them inside huge domes called Snowglobes. (NSA: Snowglobe 7)

In the 23rd century, three-quarters of the planet's landmass was drowned by water. Humans built islands and colonised parts of the oceans for research and other uses. London was totally flooded. (VG: TARDIS) Venice prepared to finally submerge into the waters of the Laguna. (BFA: The Stones of Venice)

By the 52nd century, winters never occurred due to global warming. (WC: The Frozen)

Global warming on other planets
Global warming on Flydon Maxima led to an increase in water levels, rising above the previous 88% water surface coverage. This led to the renaming of the planet as "Despair" and an evacuation, mainly to Flydon Minima. Others adapted to living in floating cities, surviving on fish, seaweed and rainwater. (TDL: The Depths of Despair)