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The climate-driven mass extinction no one had seen before now

Sixty-three percent. That's the proportion of mammal species that vanished from Africa and the Arabian Peninsula around 30 million years ago, after Earth's climate shifted from swampy to icy. But we are only finding out about ...

Prehistoric Swiss Army knife indicates early humans communicated

Archaeologists have found that a tool, dubbed the "stone Swiss Army knife" of prehistory, was made to look the same in enormous numbers across great distances and multiple biomes in southern Africa. This indicates early humans ...

Tropical forests nearing critical temperatures thresholds

Global warming is driving leafy tropical canopies close to temperatures where they can no longer transform sunlight and CO2 into energy, threatening total collapse if the thermometer keeps climbing, according to a study Thursday.

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