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The researchers examined sea level measurements in three locations around the Indian Ocean dating back to the 1800s and found that the raw sea level measurements showed no clear rise in sea levels.
Their study was published in the journal Earth Systems and Environment, and it calls into question adjusted official data showing steadily rising sea levels – which most scientists say is caused by manmade global warming.
The top graph in the following image shows the unadjusted sea level data in Mumbai, India, where each color represents a different set of measurements at the same location.
The bottom graph shows the adjusted data:
The study’s authors say this is evidence that the adjustments are biased.