A University of Arizona-led effort to reconstruct Earth’s climate since the last ice age, about 24,000 years ago, highlights the main drivers of climate change and how far out of bounds human activity has pushed the climate system.

A University of Arizona-led effort to reconstruct Earth’s climate since the last ice age, about 24,000 years ago, highlights the main drivers of climate change and how far out of bounds human activity has pushed the climate system.