Signal Human activity has tripled atmospheric mercury since 1850

Summary

The report cites mercury as another example of a persistent toxic metal. Human activity has tripled mercury levels in the atmosphere since 1850. This has raised long-term exposure for wildlife around the world. Effects such as lower breeding success and changes in behaviour have been seen in some populations. The report explains that, depending on the definition, naturally occurring elements such as metals can count as novel entities when humans alter their cycling and chemistry. It also argues that persistent substances resist breakdown, spread worldwide and cause harm long after release, so society's ability to reverse the global impacts of novel entities is limited.