Niagara Falls will have eroded away the remaining 32 km to Lake Erie, and ceased to exist. According to Berger and Loutre, the current interglacial period ends sending the Earth back into a glacial period of the current ice age, regardless of the effects of anthropogenic global warming. The many glacial lakes of the Canadian Shield will have been erased by post-glacial rebound and erosion. The length of the day used for astronomical timekeeping reaches about 86,401 SI seconds, due to lunar tides decelerating the Earth's rotation. Under the present-day timekeeping system, either a leap second would need to be added to the clock every single day, or else by then, in order to compensate, the length of the day would have had to have been officially lengthened by one SI second.