A new report on the state of the world's oceans by the International Program on the State of the Ocean (IPSO) and the International Union for the Conservation of Nature warns that combined threats to oceans are creating conditions where there is "a high risk of entering a phase of extinction of marine species unprecedented in human history." The reality is that an unprecedented range of threats are coming together to challenge the health of oceans and underwater life. The report identifies the main drivers of these threats, including: climate change, overexploitation, pollution and habitat loss. The report also finds increasing hypoxia and anoxia along with warming oceans and increasing acidification are creating multiple stressors on the world's oceans- and multiple stressors are, in their words, a precondition for other mass extinction events in the Earth's history.