The article mentions that microplastics are found at the bottom of the Mariana trench, but fails to mention that even plastic bags and candy wrappers have been found [1]. No need to look at Carbon-14 to find far reaching impacts of humans.

[1] https://www.bbc.com/news/science-environment-48230157

Well, really "scientists today have found carbon-14 and other radioactive traces of atomic testing pretty much everywhere they've looked..."

https://www.knoxnews.com/story/news/2020/01/11/manhattan-pro...