| Marine fossil evidence tells of numerous extinctions, global mass extinction, and geochemical events. |
| During these ice ages, the decrease in global temperature led to mass extinctions. |
| The result will be a series of mass extinctions and a dramatic fall in the planet's biodiversity, as well as its ability to support humankind. |
| Unlike previous mass extinctions this current episode is due to the disruptive activities of just one species, man. |
| Prominent biologists say we're on par with the five previous mass extinctions in the history of life on earth. |
| There have been at least five mass extinctions till now, all by natural forces. |
