Since the state of marine ecosystems is not as readily apparent as that of their land-based counterparts, the report especially focuses on informing the public and decision-makers about the oceans. Over the past 150 years, human beings have caused massive changes to many parts of the oceans. Thanks to human activities, half of all coral reefs have now been lost. Although entire coral reefs are fairly visible in shallow tropical waters, the same can’t be said for the cold-water corals and sponge reefs in the ocean depths, which are endangered by fishing and marine litter. Similar to polar bears, whose habitat is disappearing as climate change progresses, the coral reefs are an icon of biodiversity. But, just as polar bears aren’t the only Arctic species affected, but are joined by a host of birds, marine mammals and smaller life forms, the loss of species in the oceans is very likely much more widespread than what we’re capable of observing.
That being said, based on the amount of coral reefs lost and the expected global losses through the end of the century, we can deduce that the number of irrevocably lost species is high and continues to rise. Unfortunately, in contrast to the situation on land, we don’t even have projections for marine species. In many cases, we don’t know what functions the extinct and endangered species performed and still perform for other marine fauna and flora in the marine ecosystem, since the long-term observation of marine food webs is an extremely involved and expensive undertaking. But, just as bees are essential to the pollination of many plants, there are also close connections between species in the sea. Further, according to the IPBES report, many species that are not extinct have nonetheless been severely impacted by human activities: one third of the fishing stocks we use are overfished or have already collapsed. And experts predict that climate change will reduce algal growth by 10 percent and the total amount of fish by 25 percent over the next several decades.
According to the IPBES report, released on 6 May, tackling these pressing issues will require comprehensive efforts to achieve the United Nations’ Sustainability Goals, which chiefly focus on human beings and our living environment. These include putting an end to hunger, preserving life on land and in the oceans, guaranteeing health, and stopping climate change. According to the IPBES, these problems can only be solved by working together, and by combining scientific findings with societal transformations. To make that happen, we have to start doing a better job of respecting and protecting biodiversity all over the planet – in our own backyards, but also in places where we can’t directly see the changes. Not only because of their benefits, but also for the sake of finding a balanced coexistence for all life on Earth, we have to take immediate steps and put a stop to the loss of species.