Sialensiau Amgylcheddol : Environmental Challenges
Clipiau : Clips
Wefannau : Websites
https://www.bbc.co.uk/bitesize/clips/zj8hfg8
https://geographycasestudy.com/sustainable-tourism-and-ecotourism/
https://www.footprintnetwork.org/our-work/ecological-footprint/
