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Castelnuovo Berardenga, located in Siennese part of Tuscany, Italy, is often treated as a kind of appendage of Sienna if it is considered at all by visitors to the province of Sienna.
The scientists who visit the island, by contrast, come to see what life will be like in the future. Owing to a quirk of geology, the sea around Castello Aragonese provides a window onto the oceans of 2050 and beyond. Bubbles of CO2 rise from volcanic vents on the seafloor and dissolve to form carbonic acid. Carbonic acid is relatively weak; people drink it all the time in carbonated beverages.