Acidic Oceans Linked to Greatest Extinction Ever

Rocks from 252 million years ago suggest that carbon dioxide from volcanoes made sea water lethal and caused The Great Dying, which might represent a worst-case scenario for the future if CO2 emissions continue to rise, according to . Today, oceans are becoming more acidic as a result of the large amounts of CO2 produced by human activities such as the burning of fossil fuels; the average pH has dropped by 0.1 units since the beginning of the Industrial Revolution. The Great Dying , says Clarkson.

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