This is the key of the article: Rothman looked through these geologic records and observed that over the last 540 million years, the ocean’s store of carbon ch

This is the key of the article: Rothman looked through these geologic records and observed that over the last 540 million years, the ocean’s store of carbon changed abruptly, then recovered, dozens of times in a fashion similar to the abrupt nature of a neuron spike. This “excitation” of the carbon cycle occurred most dramatically near the time of four of the five great mass extinctions in Earth’s history. I'm not an expert but the term "near" in geological times is not so "near" in life span times, I think the article is not so objective... However, that we're creating a problem is obvious.