Sentences with phrase «significant extinctions»

2.3 billion years ago, «the probably most significant extinction event in history» took place.

And yet the IPCC itself warned last year that as global average temperature increase exceeds about 3.5 °C [relative to 1980 - 99], model projections suggest significant extinctions (40 - 70 % of species assessed) around the globe.

As he noted the absence of quail (Coturnix sp.), roadrunners (Geococcyx californianus), sage thrashers (Oreoscoptes montanus), and other chaparral - dependent species, he realized that there had been significant extinction in some of these old patches.

The SMC is full of dust, and the visible light emitted by its stars suffers significant extinction.

«The rate at which carbon is being absorbed by the ocean is already far greater now than at the time of the last globally significant extinction of marine species, some 55 million years ago, when up to 50 % of some groups of deep - sea animals were wiped out.»

The IPCC's Fourth Assessment says, «As global average temperature increase exceeds about 3.5 °C [relative to 1980 to 1999], model projections suggest significant extinctions (40 - 70 % of species assessed) around the globe.»

Unsustainable hunting for consumption and trade of wild meat (also known as bushmeat) by humans represents a significant extinction threat to wild terrestrial mammal populations, perhaps most notably in parts of Asia, Africa and South America [4 — 6].

However, population viability models in African wild dogs suggest that diseases causing high adult mortality can pose a significant extinction threat [19].

This resulted in a significant extinction event that is well documented in the fossil record and took thousands of years for the earth to recover from.

He warned that, if global average temperature exceeded «about 3.5 ºC, model projections suggest significant extinctions (40 % — 70 % of species assessed) around the globe» [italics added].

It's also important to bear in mind that takes a very long time to recover the biodiversity loss from a significant extinction event: