An estimated 7 million tons of rubbish arrives in the world's oceans each and every year.http://www.cnn.com/2010/TECH/science/04/12/plastiki.kiernan.plastic/index.html
Tricky one... you see, not much would be much to little do do you any good, yet too much would be much too much. Instead, try for "the right amount", which would be more than much too little but less...