Signs of the human era, from nuclear fallout to microplastics

As scientists make the case that humans have fundamentally transformed the planet enough to warrant our own geological epoch, another question arises: is there anything left untouched by humanity's presence? Soaring greenhouse gases, ubiquitous microplastics, pervasive "forever chemicals", the global upheaval of animals, even old mobile phones and chicken bones -- all have been put forward as evidence that the world entered the Anthropocene, or era of humans, in the mid-20th century...