The BBC recently published an article discussing the accuracy of estimating extinction of species on the planet. The article examines a currently used model for estimating rates of extinction and some scientists do not believe the model is accurate. Too many variables come into play to really determine how fast species are disappearing from our planet. We also do not know exactly how many species exist on the planet. There is consensus that we seem to care more about "charasmatic species" rather than focussing our attention on the microorganisms and smaller species that may be disappearing each day. Learn more by reading the article here.