Toronto Star: Humankind may be at the dawn of a new age, one that might not bring the word "Aquarius" to mind. In fact, the arrival of the Anthropocene epoch may include the sixth-largest mass extinction in the Earth’s history, according to a report in the journal Environmental Science & Technology, which is to appear online Monday and in print Wednesday. Scientists behind the report say that in just two centuries, humans have wrought such vast and unprecedented changes that we actually …