By comparison, 46% of people who had not performed any environmentally friendly behaviour had bought or received second-hand items in the last 12 months.
Mewn cymhariaeth, roedd 46% o bobl nad oedd wedi cyflawni unrhyw ymddygiad ecogyfeillgar wedi prynu neu dderbyn eitemau ail-law yn y 12 mis diwethaf.