Global Warming seems like it's been a hot topic of discussion for the last couple of decades as we learn more about our environment and the impact we have on it as humans. Surprisingly, though, we're not even in the warmest period the Earth has seen, and now scientists may have a better understanding of what we're in for in the future.
According to a report by Science News, the Spanish Cuevas de Artà off the Balearic island of Mallorca has revealed mineral deposits that were the result of higher water levels from long ago. Scientists have dated these deposits to a time that could be over five million years old, a period known as the Pliocene Epoch.
source http://www.ign.com/articles/2019/12/30/crystal-caves-show-sea-levels-were-raised-50-feet-during-warm-period-in-history
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