Before / after
Drag the line. Watch it change.
Five of the planet's most visible transformations - pull the slider (or use your arrow keys) to reveal what we're losing.
Healthy reefDrag the handle · or focus it and use ← → keysPhotos: Wikimedia Commons
Tropical coral reefs
Coral Bleaching
~50%of shallow corals lost since 1995
When the ocean stays just 1-2°C too warm for weeks, corals expel the algae that feed and colour them, turning bone-white. Prolonged bleaching kills them - and the world has lost roughly half its shallow corals since 1995.
Before
Healthy reef
After
Bleached & dead