half of all species on earth are or soon will be extinct. What we are doing to our oceans mirrors what we did to terrestrial species some 50 - 100 thousand years ago. Our oceans are also already in the midsts of a mass-extinction.
Pollution is a huge part of the problem from CO2 that acidifies our oceans to plastic and other waste materials that we are continuously flush into our waterways. What we have done to our oceans is not only harmful to wildlife it is also harmful to us.