Author

Elizabeth Kolbert

16 key ideas across 2 books, each explained in our own words.

The Sixth Extinction

IDEA 1
A new mass extinction has begun
Kolbert argues that humans are causing the sixth mass extinction in Earth's history. Species are disappearing at a rate far faster than normal, mainly because of human activity. She presents this as a warning based on scientific evidence.
IDEA 2
Earth has seen five before
Kolbert describes the five past mass extinctions, including the one that wiped out the dinosaurs. Each was caused by dramatic changes, such as asteroid strikes or climate shifts. These events show that life on Earth can change sharply and quickly.
IDEA 3
Frogs are vanishing fast
Kolbert describes how a fungus spread around the world, killing many frog species, including Panama's golden frog. Humans helped spread the fungus through travel and trade. Her account shows how one small organism can harm a whole group of animals.

IDEA 1
We fix nature with more control
Kolbert argues that humans now try to solve environmental problems caused by earlier interventions by intervening again. Each fix, she shows, often creates new problems. In her view, this pattern makes it hard to simply step back and let nature heal.
IDEA 2
Rivers were reversed and invaded
Kolbert describes how Chicago reversed the flow of its river, linking two great water systems. Now officials use electric barriers to keep invasive carp from spreading. The story shows how fixing one problem can create another.
IDEA 3
A tiny fish needs human help
Kolbert describes the Devils Hole pupfish, which lives in a single desert pool. Scientists have built a copy of its pool to keep the species alive. It shows how some species now survive only because people look after them.

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