Eco Audit: How many species are there on earth? Posted on October 31, 2013 by Karl Mathiesen 0 Guardian Eco Audit 30 October, 2013 The discovery of new species in relatively well-explored Australia leads Karl Mathiesen to investigate how many other natural wonders may exist unknown to science. Read more here. Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)Click to email this to a friend (Opens in new window)Click to print (Opens in new window)Like this:Like Loading... Related