1) THE MOAI OF EASTER ISLAND
The 2,000-year-old faces were built by the Polynesian peoples who originally settled the island, which they called Rapa Nui.
But the effects of climate change — notably, sea-level rise and coastal erosion — are already in progress on the tiny, remote island.
Huge, violent waves buffet the ancient statues, damaging their stone bases. If they get too damaged, they could topple over.