Greenland’s melting ice will put South Florida in the drink

If you’ve ever flown between the United States and Europe, you may have noticed a giant white area showing up in the North Atlantic on the onboard flight tracking maps. It’s Greenland.

Most people pay little attention to this white monolith. However, we should, since it will largely determine South Florida’s future.

Greenland is an oddity. It’s the world’s largest island, but the least densely populated country with just 56,000 inhabitants. It’s huge, roughly the same size as the Eastern United States, from Maine to Florida, from the Atlantic to the Mississippi River.

Here’s the reason Florida needs to pay attention to Greenland. Eighty percent of the island is covered by a massive ice sheet, up to two miles thick. It’s safe to say that Greenland is

ground zero for global sea-level rise as its giant ice sheet is now melting faster and faster.

If the ice sheet and glaciers on Greenland fully melt, global sea level would be 24 feet higher. To be clear, a full meltdown would take many centuries. But even 10 percent melting would cause a few feet of higher sea level, which would be catastrophic for all low-lying coastal areas globally.

Not only is South Florida at risk, but from San Francisco to Shanghai and from Copenhagen to Calcutta, vulnerability is worldwide. As sea level rises, all coastlines move inland, even through marshlands like the Everglades and up tidal rivers like the Potomac.

It’s difficult for most of us to fathom sea level being much higher because for about 6,000 years, essentially all of recorded human history, the polar ice caps and sea level have changed little. Yet geologic history makes clear that sea level and coastlines change greatly, by hundreds of feet, following the natural cycles we know of as the ice ages.

Today as the burning of fossil fuels warms the planet far faster than the natural pattern, ice melting is accelerating.

The extra heat now stored in the ocean means that sea level can no longer be stopped this century. We have passed a

tipping point.

That translates into more flooding in most coastal communities. So far sealevel rise is just a fraction of an inch a year, but like a drip filling a bucket, the effect is cumulative. It’s now increasing exponentially. By mid-century, global average sea level could be one to two foot higher; by the end-of-century, the extreme scenarios project as much as eight feet higher.

We can never abandon the shoreline. We need to be near the sea for shipping, commercial fishing, and recreation. There is also the magical appeal that the sea has

for humanity. The point is that we cannot give up the coastal zone.

If we pretend and deny that the sea will rise, we will not be ready for the new coastline as sea level rises to heights unknown by modern man. We can bury our heads in the sand, or we can begin to plan and adapt. We can design viable coastal communities for the future. There is no time to delay. We need to be bold.

The recent commemoration of the bold plan to put a man on the moon might serve as inspiration for what we can accomplish with the right vision, the right resources and leadership. Responding to the challenge of the rising sea and shifting shorelines will likely be even more of a challenge than putting a man on the moon.

We must rise with the tide, keeping a close eye on Greenland. For those wanting to see what is happening in Greenland firsthand, the International Sea Level Institute is organizing a VIP fact-finding trip, September 8-15, 2019. For info: www.greenland2019.johnenglander.net

John Englander is an oceanographer and president of the International Sea Level Institute, a nonprofit think tank and policy center. He wrote this piece for “The Invading Sea,” an editorial board collaborative of the South Florida Sun Sentinel, Miami Herald and Palm Beach Post, with reporting help from WLRN Public Media.