North America

Green Impact What killed 5 million sea stars off the coast of North America?

This epidemic, known as sea star wasting disease, swept from Mexico to Alaska, hitting over 20 species and collapsing one of the ocean’s most important predator populations.

Green Impact What drove North America’s large mammals to extinction after the last ice age Joseph Shavit

Space Scientists discover America’s largest impact crater from 35 million years ago Joseph Shavit

Discoveries Dinosaurs roamed the northern hemisphere millions of years earlier than previously thought Joshua Shavit

Discoveries Powerful geological changes are happening beneath the United States Joseph Shavit

Space Scientists discover massive underwater crater that is 3x larger than the Grand Canyon Joseph Shavit

Green Impact Scientists discover why large mammals vanished from North America 50,000 years ago Joseph Shavit

Green Impact Scientists solve the mystery of why mammals went extinct in North America 50,000 years ago Joseph Shavit

Discoveries The Great Die-Off: Why North American mammals went extinct 50,000 years ago Joseph Shavit

Discoveries Scientists solve the mystery of North America’s mammal extinction 50,000 years ago Joshua Shavit

Discoveries Study challenges theories of earlier human arrival in Americas Joseph Shavit