Only five northern white rhinos left on Earth and all to old to breed.

[Spider Jerusalem]

18. Technology is really part of the problem, though

there are too many humans. We're too clever, and have been too successful. Human activity (clearcutting forests for agriculture, damming rivers for irrigation, logging, road-building, mining, fossil fuel extraction) is directly responsible for most habitat loss and species decline (along with hunting). Human activity in burning fossil fuels and dumping CO2 into the atmosphere is responsible for climate change on what will probably be a catastrophic scale. Of course, this sort of climate-change driven mass extinction has happened several times before in the history of the planet, most notably the Permian extinction event, but there isn't much question that the current one has been accelerated by human behaviour. Want to slow it down (although probably, not avert it)? The answer is "fewer humans using fewer resources". I don't see the number of people on the planet dropping by 90% anytime soon, though.