Based on the clue 'about 80 of this gas in the air comes from decompo...', what is the answer?

Based on the clue 'about 80 of japans butter cheese is produced on t...', what is the answer? Based on the clue 'about 80 of latin america belongs to this religiou...', what is the answer? Based on the clue 'about 80 of the motorcycles bought in the us are p...', what is the answer? Based on the clue 'about 80 of the worlds soccer balls are made in th...', what is the answer? What is associated with: about 80 of this mediterranean islands 700000 people speak greek about 18 speak turkish? What is associated with: about 800 bishops other churchmen participated in this council i from dec 1869 to oct 1870? What is associated with: about 8000 british prisoners were taken in this last major battle of the war? What is associated with: about 80000 scots still speak the scottish version of this ancient celtic language?