Dichlorodifluoromethane, more commonly known as Freon (CF2_2Cl2_2), is a type of coolant for refrigerators and air conditioners. It was used widely until the 1990s when it was discovered that Freon destroys the ozone layer.

Hole in the ozone layer, 1998. Freon was a huge contributor towards the formation of the hole.

Image Source: By NASA [Public domain], via Wikimedia Commons

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