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Catastrophism provides the context for addressing “lost civilization.” When considering the scale and magnitude of past events, it can help explain why civilizations became lost. One example discussed is coastal societies: massive melt led to sea level rise, described as oceans going up about 300 meters, with a specific figure cited as 400 feet (about 150 meters), enough to eliminate a coastal city.
The discussion then shifts to evidence from oxygen isotopes and Greenland ice cores. A graph of the last 10,000 years of temperature change preserved in Greenland ice shows temperature repeatedly warming and cooling by about 2–3°F or more. The left axis represents depth in the ice (0 at the ice surface, with 1500 meters representing depth), and the right-hand axis represents time in thousands of years. Shifts to the right indicate warming and shifts to the left indicate cooling. Around 10,000 years ago, the timeline includes the transition out of the ice age. A warming phase is followed by a spike where a 2–3°F cooling lasts one to two centuries. The speaker compares such an event to present conditions, saying it would involve extreme worldwide agricultural failure, famine, and mass mortality.
The speaker emphasizes that the magnitude of the temperature oscillations increased as the present approached. The most recent geological epoch, the Holocene, is characterized as the period during which civilizations have arisen because climate was conducive to an agricultural foundation. The speaker also lists specific climate episodes and their claimed historical consequences within the same general graph timeframe: the medieval warm period, the Roman warm period, and the Little Ice Age. The Little Ice Age is described as leading to famine and agricultural failures, and the speaker connects this to outbreaks of bubonic plague and the Black Plague, stating it ended the great cathedral-building era in the 1300s. Late Antiquity and the dark ages are linked to the Justinian plague, described as wiping out a third of Europe’s population.
The speaker notes that what comes next is not yet explained and is described as a “complete mystery,” urging attention to the remaining graph after asserting that claims of catastrophic climate change “unprecedented” in speed and magnitude require examining the rest of the graph.