People were also asked about four methods of repairing and re-using; and were further asked if they had performed these within the last 12 months.
Holwyd pobl hefyd am bedwar dull o atgyweirio ac ailddefnyddio a gofynnwyd iddynt hefyd a oeddent wedi cyflawni'r rhain o fewn y 12 mis diwethaf.