A large crowd looks towards a brightly lit stage at night. Above their heads are coloured banners.

Gofyn i bobol sy’n mynd i Wyliau bi-pi'n gyfrifol

Mae ecolegwyr o Brifysgol Bangor yn tynnu sylw at un peth hanfodol y gall rhai sy’n mynychu gwyliau ei wneud i helpu i ofalu am yr amgylchedd: pi-pi’n gyfrifol.

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