Humans have made an indelible mark on the planet. Since the mid-20th century, we've accelerated the digging of mines, construction of dams, expansion of cities and clearing of forests for agriculture — activity that will be visible in the geological record for eons to come.
Some scientists are calling it the Anthropocene era, or the age of the humans ("anthropos" is Greek for human), and argue that geologists should recognize it as a distinct chapter in Earth's history. But after more than a decade of investigation and debate, that won't happen, at least for now.
