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.<p>[1] <a href="https://www.bbc.com/news/science-environment-48230157" rel="nofollow">https://www.bbc.com/news/science-environment-48230157</a>