The Sixth Extinction

An Unnatural History

Elizabeth Kolbert · 2014 · Science

12 min · 12 chaptersNarrated in your voice

Original summary · AI-drafted, human-published · added by Library

What it's about

Kolbert argues that human activity has triggered a sixth mass extinction, comparable in scale to the five recorded in the fossil record, but caused not by asteroids or volcanoes, rather by one species reshaping climate, chemistry, and habitat everywhere at once. Blending field reporting with the history of extinction science, the book made the abstract idea of biodiversity loss concrete and won the 2015 Pulitzer Prize for General Nonfiction.

Reading plan

Pick a finish date and Genius lays out the days — the plan shows today's target and keeps you honest.

Read together

Start a circle and share the code — everyone sees everyone's honest place in the book. Accountability, not leaderboards.

Who it's for

- Readers curious how scientists reconstruct catastrophes that happened millions of years before anyone could observe them - Environmentally engaged readers who want one coherent account of the biodiversity crisis rather than scattered headlines - Nonfiction readers who like science explained through travel, fieldwork, and conversations with the researchers doing it

What’s inside

1
The Idea of Extinction
Georges Cuvier's claim that species can vanish entirely upended the assumption of a fixed, unchanging natural order and made mass extinction a thinkable event long before anyone had proof one had occurred.
1 min
2
The Asteroid and the Ammonites
The Alvarez team's 1980 discovery of an iridium spike proved that a single catastrophic event, not gradual selection, ended the age of dinosaurs, showing that extinction can be abrupt rather than only slow.
1 min
3
The Frog and the Fungus
The near-total collapse of amphibian species from a fungal pathogen shows that current extinction is not an abstract future threat but an ongoing, observable event moved along by human trade and travel.
1 min
4
The Sea Around Us
Ocean acidification, driven by the same carbon dioxide causing climate change, attacks marine chemistry directly and may undermine shell-forming organisms and food webs faster than warming does.
1 min
5
Islands and Fragments
Cutting habitat into isolated fragments, even without destroying the total area, is often sufficient by itself to unravel ecosystems, because species depend on connectivity and range as much as raw acreage.
1 min
6
Invasive Species and the New Pangaea
By transporting species across oceans and continents at unprecedented speed, humans have functionally reassembled the ancient supercontinent, and the resulting mixing of previously separated biotas is itself driving extinctions.
1 min
7
Neanderthals and the Overkill
The disappearance of Neanderthals and Ice Age megafauna alongside the spread of Homo sapiens suggests humans have been reshaping extinction patterns since long before industrialization, not just since the fossil fuel era.
1 min
8
Coral and the Anthropocene
Coral reef bleaching, caused by warming and acidification acting together, functions as an early, visible marker of a new geological epoch in which one species has become a force comparable to the asteroid that ended the Cretaceous.
1 min
9
What We Leave Behind
Kolbert argues that the same human traits, symbolic thought, technological invention, and restless expansion, that caused the sixth extinction may be the only available tool for slowing it, though she stops short of predicting that people will use it.
1 min
10
Where the Argument Runs Thin
1 min
11
Final summary
1 min
12
Actionable advice
1 min

About Elizabeth Kolbert

Elizabeth Kolbert has been a staff writer at The New Yorker since 1999, focusing on science and the environment. She previously wrote Field Notes from a Catastrophe, on climate change. The Sixth Extinction won the 2015 Pulitzer Prize for General Nonfiction and established her as a leading science journalist.