According to a study published this week in PNAS , this sets off a feedback loop that acidifies the ocean even more quickly, a process that is already killing off foundational marine life species such as coral and threatening the balance of all ocean ecosystems on which we depend. “Our study confirms that humans are now a geological force capable of impacting the Earth’s system, like a super-volcano or a meteoritic impact,” Olivier Sulpis, an earth science researcher at McGill University and lead author on the study, said to Motherboard in an email.