What is the fast-melting 'Dark Zone' in Greenland?
Scientists have identified a 'Dark Zone' in the Greenland ice sheet's western part, which is melting up to five times faster than surrounding ice due to contamination with algae, dust and soot from wildfires. The zone measures 400 km in length and spans 100 km at its widest part. Researchers fear the zone is contributing to global sea level rise.