One of the scariest effects of climate change might already be happening — and it'd mean our projections are way off

Alessandro Silvano

• Warm waters are pooling underneath Antarctic glaciers in a way that's causing glaciers to melt more rapidly and preventing the formation of cool water beneath Antarctica, according to a new study.
• This could slow ocean currents and potentially lead to a rapid sea-level rise event known as a pulse.
• Such an event could be devastating, causing sea levels to rise by more than 10 feet by the end of the century.

The worst-case climate...