Event that occurred billions or millions of years ago
Event that occurred thousands of years ago
Event that occurred decades ago
cartion dioxide levels reach their highest levels on record
#oxygen builds up in Earth's atmosphere
#the last Ice Age ended
Event that occurred billions or millions of years ago: The formation of the Earth's moon through a collision between a Mars-sized object and the early Earth.
Event that occurred thousands of years ago: The construction of the Great Pyramids of Giza in Ancient Egypt.
Event that occurred decades ago: The fall of the Berlin Wall in 1989, symbolizing the end of the Cold War.
Carbon dioxide levels reach their highest levels on record: This event is ongoing and refers to the current rise in atmospheric carbon dioxide levels due to human activities, particularly the burning of fossil fuels.
Oxygen builds up in Earth's atmosphere: This event occurred about 2.5 billion years ago during the Great Oxygenation Event, when photosynthetic organisms produced enough oxygen to significantly change the composition of Earth's atmosphere.
The last Ice Age ended: This event occurred approximately 11,700 years ago, marking the transition from the Pleistocene epoch to the Holocene epoch and the retreat of glaciers and ice sheets across the globe.