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You obviously don't know how global temperature works. I'm no expert, but let's just say one part of the world being hot in the past doesn't mean that the Earth's average temperature was higher.
However, one should also not rule out another civilization existing back then.
The sad fact is, people will continue to do something, until the negative effects are too late.
Warm Water Under Antarctic Glacier Spurs Rapid Melting...
A two-month-long expedition to one of the most remote sites on the planet — the sprawling Pine Island Glacier in Antarctica — has revealed that currents of warm water beneath the glacier are melting the ice at a staggering rate of about 2.4 inches (6 centimeters) per day.
An international team of researchers journeyed to the southernmost continent to study the Pine Island Glacier, which is the longest and fastest-changing glacier on the West Antarctic Ice Sheet. This region, in the far reaches of Antarctica, has been of particular interest to scientists because it is among the most rapidly melting ice masses in the world, thinning as it flows to the Amundsen Sea at a rate of about 2.5 miles (4 kilometers) each year.
Since warm seawater flows beneath the ice shelf (the part of the glacier that floats on the ocean), scientists have known that the Pine Island Glacier was melting from below. Now, using sensors deployed across the 31-mile-long (50-km-long) glacier, the researchers have gauged the rate of glacial melt beneath the solid ice. [Album: Stunning Photos of Antarctic Ice]
It has been suggested that this recent acceleration could have been triggered by warm ocean waters at the end of PIG, where it has a floating section (ice shelf) approximately 50 km (31 mi) long. It has also been shown that PIG underwent rapid thinning during the Holocene, and that this process may continue for centuries after it is initiated.
....How does anybody know this climate change isn't natural regardless of how it's happening ?