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Zoologist Sarah Otto, with the University of British Columbia, has published a report in the journal Proceedings of the Royal Society B regarding human influence on evolution over the past century. She notes that the number of changes that have occurred over such a short span of time is unprecedented.
The evolutionary development of humans has led to massive changes to planet Earth. Humans have cut down forests, polluted the air, rivers, streams, and even the ocean. We have warmed the planet, increased ocean acidity and have altered the course of evolutionary history for an untold number of species. In her report, Otto focuses on adaptation, speciation and extinction over just the past hundred years.
History - Percent - Animals - Earth - Extinctions
She points out that history is filled with extinctions—approximately 90 percent of all animals that have ever lived on Earth are now extinct. But most such extinctions, she notes, have been gradual. What is new is the speed at which species have gone extinct over the past century and the fact that just one species is responsible. She further notes that diversity has changed both...
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