In an article published last year in Scientific American, Caleb Sharf, the director of Columbia University's Astrobiology Center, talks about The Unstoppable Extinction And Fermi’s Paradox.
There has been a lot of discussion recently about the evidence that we are currently within a period of mass extinction, the kind of event that will show up in the fossil record a few million years from now as a clear discontinuity, a radical change in the diversity of life on the planet. This Holocene extinction (or sixth extinction) seems to have started around 10,000 years ago with the disappearance of mammalian megafauna, and appears to be continuing - or restarting - in modern times, with theoretical estimates of as many as 140,000 species currently going extinct per year.
That this all coincides with the 'rise' of modern humans and our measurable impact on the planet - from rapid climate change, to our severe re-sculpting of the physical, chemical, and biological structure of the planetary surface - strongly suggests that this extinction event is causally related to our activities.
It's sobering, guilt inducing, and rather depressing. But it also brings into focus some rather profound questions about the nature of the survival of a species, and the notion of preserving or maintaining the 'natural' status quo...
So far, so good! Unfortunately...