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Signing of the Montreal Protocol: International treaty designed to protect the ozone layer by phasing out the production of numerous substances responsible for ozone depletion.

Increase in the use of fossil fuels had a significant impact on the composition of the atmosphere, leading to an increase in carbon dioxide levels and subsequent global warming.

Eruption of Mt. Pinatubo: Its eruption lead to a sizable release of sulfur dioxide into the atmosphere, causing global temperatures to drop by about 0.5°C for a year.

The peak of the last Ice Age, with large ice sheets covering much of the Northern Hemisphere, reflecting sunlight and keeping the planet cooler.

A period with higher than average global temperatures and relatively stable climate, leading to prosperous development of early human civilizations.

Eruption of Krakatoa: Released large quantities of ash and sulfur dioxide into the stratosphere, leading to global cooling and vivid sunsets for several years.

Paris Agreement signed: To address climate change and its negative impacts, 196 Parties adopted the Paris Agreement to limit global warming to well below 2°C.