Why Half-a-Degree Matters to the Global Climate

The Paris Climate Agreement negotiated in France last December and signed at United Nations headquarters last week included two warming temperature limits: 1.5 and 2.0 degrees Celsius above pre-industrial times. VOA's Rosanne Skirble reports on a new study that finds the additional 0.5°C would mean a 10-cm-higher global sea-level rise by 2100, longer heat waves, and a greater threat to virtually all tropical coral reefs.