Genetic Entropy - Alan K. Walker

Evolution predicts that over time, because of mutations and natural selection, the best of the mutations will be preserved and the species improved in its overall fitness. Real life experience and experimental evidence, however, reveal a disturbing downhill trend. Mildly harmful mutations are not negatively selected and accumulate, producing an overall decreased fitness. This is true even though severely harmful mutations are eliminated by decreasing the organism's ability to live and reproduce. And even if there were occasional favorable mutations (which is highly debatable) each species is heading inextricably towards extinction.