科学家过去普遍认为，地球已进入第六次物种大灭绝（The Sixth Mass Extinction），大批物种的消失速度比自然状态下的消亡速度高出100倍。美国亚利桑那大学一项最新研究对此提出反驳，认为有关说法并不符合目前证据，物种灭绝速率大约在一个世纪前达到峰值，此后总体呈下降趋势。

New research finds extinction rates have been declining for a century, challenging assumptions of an ongoing mass extinction.

Chimneys spew pollution into the atmosphere in a ruined landscape. Within a human lifetime, concentrations of CO2 in Earth's atmosphere could reach levels associated with 19 "mass extinctions" that ...

If you’re an animal living through a mass extinction, it’s best to be one that’s found a unique way to make a living. A new analysis of the species that lived or died out in the wake of the asteroid ...

The Cretaceous-Paleogene mass extinction, occurring approximately 66 million years ago, represents one of the most dramatic biotic crises in Earth’s history. It is marked by the abrupt disappearance ...

Welcome to what scientists call the Sixth Mass Extinction. Unlike previous mass extinctions caused by asteroids or volcanoes, ...

The Cretaceous–Paleogene (K–Pg) mass extinction event, marking the boundary between the Cretaceous and Paleogene periods approximately 66 million years ago, stands as one of the most profound ...

An international team of botanists finds no proof of extinctions in Centinela, but abundant evidence that Centinela's flora lives on in the scattered remaining fragments of coastal Ecuador's forests.

Extinction is a natural byproduct of life and evolution, but an alarming number of species have entered the dustbin of history thanks to human activity — which is anything but natural. "The solution ...

(CNN) — No species lasts forever — extinction is part of the evolution of life. But at least five times, a biological catastrophe has engulfed the planet, killing off the vast majority of species from ...

Life on our planet has experienced many mass extinctions over its 4.5 billion years. Scientists see evidence for at least five major episodes that eradicated creatures great and small. And many ...