The main threats to rocks and scree come from overgrazing livestock, atmospheric pollution, erosion through recreational use, climate change, invasive species, and feral goat populations.
Y prif fygythiadau i greigiau a sgri yw gorbori da byw, llygredd yn yr atmosffer, erydu drwy weithgareddau hamdden, newid hinsawdd, rhywogaethau goresgynnol a boblogaethau geifr fferal