"It is likely that all of us inhale fibers, but not all will suffer negative consequences from this exposure," says Joana Correia Prata, a Ph.D. student at the University of Aveiro in Portugal who has studied the topic but was not involved in the new paper. High concentrations could pose an occupational hazard to people who work under poorly-ventilated conditions, but we're not sure to what extent as research on the topic is thin. While human impact is still murky, current findings tend to agree on one thing: globe-trotting microplastics will very likely impact wildlife. Water—bound plastic already work their way through marine animals' digestive systems and can hinder their ability to reproduce. When airflow carries plastics to far off places––like nearly 4,700 feet above sea level, the elevation of the Pyranese study site–– virtually every habitat on the planet, no matter how remote, is susceptible to pollution.