We have created enough concrete to cover the entire Earth in a layer two millimeters thick.
The book's most famous and debated contribution to the scientific community is its pinpointing of the exact moment the Anthropocene began. While many scientists argue for the Industrial Revolution or the 1950s "Great Acceleration" (marked by nuclear fallout and massive plastic production), Lewis and Maslin argue for the year . The Human Planet: How We Created the Anthropocene
To explain how we reached this point, the authors map out human progress through energy and organizational revolutions: We have created enough concrete to cover the