Some 252 million years ago, almost all life on Earth disappeared. Known as the Permian–Triassic mass extinction – or the ...

Earth was a hothouse 201 million years ago. ... methane and other greenhouse gases were to reach atmospheric concentrations so high (probably around 30,000 parts per million) ...

Late Devonian extinction - 383-359 million years ago. Starting 383 million years ago, this extinction event eliminated about 75 percent of all species on Earth over a span of roughly 20 million years.

Tropical riparian ecosystems—those found along rivers and wetlands—recovered much faster than expected following the end-Permian mass extinction around 252 million years ago, according to new ...

The findings come from a study of bone tools discovered at Olduvai Gorge in Tanzania and dated to around 1.5 million years ago. The discovery joins other finds — such as a 1.4-million-year-old ...