Planet earth is beginning a new geological age, or epoch, scientists are calling the anthropocene.\nThis new stage reflects the warming atmosphere, changes in plant and animal populations and severe weather. \nWhen a new geological age starts, scientists look for a place that clearly shows the transition from one to the other.\nFor the anthropocene, that place could be Crawford Lake in Ontario.\nFrancine McCarthy is a professor of earth science at Brock University, and an expert on Crawford Lake.\nShe spoke with CBC's Leigh Anne Power.