Nature World: It's no secret that ocean acidification caused by climate change is currently wreaking havoc on our oceans, but a new study shows that acidic oceans also triggered the greatest mass extinction ever on Earth.
Thanks to extreme volcanic activity about 252 million years ago, the world's oceans changed so drastically that it wiped out more than 90 percent of marine species, and more than two-thirds of the animals living on land.
The event occurred when Earth's oceans absorbed huge amounts of carbon...