The Sixth mass extinction...

Over 99% of all species that ever lived are now extinct. That was a shocker, wasn't it? It was to me too, when I first read it. Anyway, there have been five past mass extinctions, and scientists think that we are in the middle of the sixth one.
Scientists think that we are losing 30,000 species a year. That's three distinct species lost forever, every hour.
So what does this mean for Earth, and of course, the animals that live on this planet? In the next 25 years, almost a quarter of the world's mammal species, and one in eight bird species are likely to become extinct.
The last mass five extinctions were caused by major geographical events, but the cause this time round - that is, for the sixth one - is different. Just one species on Earth damaging habitats and altering the atmosphere. Makes you think, doesn't it?