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Politics : Formerly About Advanced Micro Devices -- Ignore unavailable to you. Want to Upgrade?

To: Brumar89 who wrote (1417818)	9/5/2023 12:19:17 AM
From: Doren	Read Replies (2) \| Respond to of 1583868

> How do we know it was never worse before? Scientist don't know anything... but if the statistics are 99% that's pretty close to knowing. Dendrochronology goes back several thousand years... there are cores from the trees and lumber (like beams) from ancient ruins. So if they find a beam and correlate the newer rings on it with core samples from living trees, they can extend the knowledge back on the older rings telling us of good years and bad years hundreds if not thousands of years before any tree living now. Bristlecone pines reach 7000 years back, Redwoods 3000+ years. "Old growth" redwood is super hard and dense because trees had to compete for light and so grow slowly. Rings are very close together. After a redwood forest is clear cut the "new growth" wood is much softer and the rings are much wider because they grow fast in the light. Sediment layer dating tells stories too. Scientists can tell from the amount of pollen in sediment layers how the climate in that area was. A lot of pollen grains = a lot of rain. This type of thing goes back far past Dendrochronology. Ice layers also contain pollen. We can tell a lot from that. Scientist can also estimate climate from species die off that don't adapt to changing climate. For example North Africa was fairly lush savannah land during the neolithic (late stone age) period. There were a lot of crocodiles. We can tell that from the fossilized bones of we find. We also get clues from specific species of crocodiles who were left stranded in places with water even though the desert around them has no water. They may exist now only in one water hole but we find the fossilized bones all over the North African deserts. Another way we can tell are for example the Ancient Pueblo people in the S W US. They built extensive canals to irrigate larger and larger areas. But a few bad years wiped out many civilizations or caused them to migrate. Sometimes their diets change due to good or bad climates. We know 99% for sure previous climates, rainfall, droughts.