Ocean acidity has just crossed a critical threshold for marine life

The increasing acidification of the ocean - a process driven by the burning of fossil fuels - has crossed its safe limit for the first time ever, putting all marine life and ecosystems at risk. Ocean acidification is the 7th of 9 natural processes that regulate Earth’s #biosphere to exceed safe boundaries. The scientist who led the team behind this work, Johan Rockström, director of the Potsdam Institute for Climate Impact Research, explains why this ocean boundary is so important – and what we need to do to get the planet back on track.