This has resulted in a widespread, ongoing extinction of other species during the present geological epoch, now known as the Holocene extinction.

Dr. Mares notes that there was no widespread extinction of species in the eastern United States after its forests were cleared.

The deforestation is causing widespread extinction of plants and other organisms, most scientists who study the problem say.

This has caused a widespread, ongoing extinction of other species known as the Holocene extinction.

This might, he said, explain the apparent 26-million-year cycles of widespread extinctions, including the one that doomed the dinosaurs and cleared the way for mammals.

The big difference was that caused by the earlier widespread extinctions.

Major geographical changes appear to have caused widespread extinctions by the destruction of habitats.

For example, recent research [4] has analyzed a widespread extinction of plankton 2 million years ago that coincided with a nearby supernova.

We aren't even certain there was a widespread extinction at that time.

It has long been thought that during glaciations, the arctic was a region of widespread extinction and little or no evolution of new species.