The Rate of Climate Change Is Critical

Dr. Knoll used the term “rapid environmental change.” Let’s look more closely at the rate of change as recorded in ice-core data.

A graph showing carbon dioxide in parts per million from 800,000 years before present to the present day. Over most of the graph, concentrations range from 150 to 300 until near the present day, where it shoots up to 400.
Carbon dioxide (ppm) over the past 800,000 years.