So it's possible to generate a new species in a fast-reproducing organism in a century or so. Thomas demonstrates how rapidly evolution can occur, and that there is no real difference between "natural" evolution and selective breeding: both are Darwinian processes, selecting for fitness in each generation, using the natural range of genetic variation in each species. And more (but different) biological diversity, with human aid. These changes are irreversible, but there are upsides. Humans have profoundly altered ecosystems for at least the past 10,000 years. Life is flexible, and successful species, well, *succeed*. He points out that all is not gloom and doom. Thomas writes well, and is good at skewering the illogical "certainties" of certain conservation activists.
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