Global Warming Global Warning

A 7-metre sea-level rise (≈ 23 feet) is the amount of water stored in the Greenland ice sheet alone. Thesheet is more than 1.7 km thick in places; complete loss of its ice would raise mean global sea level byabout 7 m. Satellite observations show that Greenland has already lost about 4 trillion tonnes of ice inthe last quarter-century, and it is losing ice seven times faster than it was in the 1990s. For context,even 1 cm of sea-level rise exposes roughly six million additional people to coastal flooding; thus aseven-metre rise (700 cm) would threaten billions of people and most of today’s coastal cities.