Another Sea-Level Scare Story Drowns Under Scrutiny

Addressing Cohen’s climate refugee concerns first, as explored here and here, neither hurricane frequency nor intensity has increased during the period of modern warming.

So worsening hurricanes won’t drive people to abandon Miami or drive people from islands near Miami to the U.S. mainland.

As to the climate refugees Cohen believes are already trickling into to Miami, which he believes will soon become a flood, it turns out he is wrong again.

Not a single climate refugee has been proven, as discussed at Climate Realism here, nor is there reason to believe the United States or any other country is about to be swamped by climate refugees, as discussed here and here.

To The Nation’s credit, Cohen’s article has a counterpoint response from Samantha Schuyler, The Nation’s own research director. Unfortunately, Schuyler’s response is only slightly less alarmist.

“At some point, if South Florida doesn’t change its approach to navigating climate change, evacuation will be necessary,” Schuyler writes. “But by withdrawing from Miami too soon, we will lose a vibrant city that could have become a training ground for learning how to adapt to the planet’s future.”

As discussed in numerous Climate Realism articles here and here, for instance, there is no evidence whatsoever seas are rising at a unusually rapid rate.

NASA satellite instruments, measuring sea level since 1993, show global sea level rising at a pace of 1.2 inches per decade.

As shown in Climate at a Glance: Sea Level Rise, this is approximately the same pace of sea-level rise that has occurred since at least the mid-1800s. Moreover, there has been little or no acceleration in sea-level rise during recent years.

The National Oceanic and Atmospheric Administration (NOAA) maintains a tidal gauge just offshore from Miami on Virginia Key. The NOAA Virginia Key tidal gauge shows sea level at Miami is rising even more slowly than the global average of 1.2 inches per decade. Miami shows no signs of acceleration in sea level rise.

So, if sea-level rise is slower that the global average, showing no signs of acceleration, what is driving Cohen and Schuyler’s worry that Miami may soon be uninhabitable?

At the core of Cohen and, to a lesser extent, Schuyler’s concern about climate change swamping Miami are flawed computer models and actual land subsidence.

Cohen and Schuyler have seemingly joined other pop-culture climate analysts to embrace worst-case scenarios generated by computer models about the future.

However, in a recent report, some climate scientists are putting the brakes on future warming and say other researchers should avoid suspect climate models.

This research confirms what Climate Realism first reported in August 2021, the climate model Representative Concentration Pathway 8.5 (RCP8.5) produces “implausibly hot forecasts of future warming.”

Without the worst-case scenario, sea-level rise predictions are dialed back.

The one piece of evidence that Cohen did cite to make his case for rapidly rising seas is the Miami-Dade County Flooding Vulnerability Viewer, a computer mapping tool for Miami showing what the future might look like with sea-level rise.

Yet even this evidence fails to support Cohen’s claims. By doing a side-by side comparison as shown in Figure 2, you can see for yourself that Miami isn’t in need of “evacuation” at all.

Miami’s real problem isn’t rising seas as much as land subsidence. Much of Miami was built on reclaimed swamp land, and then built up with modern infrastructure.

That extra weight causes a sinking of the land, known as subsidence, allowing seawater to seep in when the surfaces sink to near sea-level. It also means that during strong rainfall events, and hurricane storm surge, areas that have subsided don’t drain as they did years before.

This is clearly covered in the scientific paper Land subsidence contribution to coastal flooding hazard in southeast Florida, published in Proceedings of IAHS in 2020.

The paper clearly states:

Preliminary results reveal that subsidence occurs in localized patches (< 0.02 km²) with magnitude of up to 3 mm yr⁻¹, in urban areas built on reclaimed marshland.

These results suggest that contribution of local land subsidence affect only small areas along the southeast Florida coast, but in those areas coastal flooding hazard is significantly higher compared to non-subsiding areas.

Subsidence is also driven by freshwater withdrawals from the region’s groundwater reserves to satisfy the Miami metro area’s growing population.

So, just as the Figure 2 comparison shows, “only small areas along the southeast Florida coast” are affected, and Miami itself is hardly in need of evacuation.

Climate activists such as Cohen and his media regurgitators at The Nation are simply making up claims and counting on nobody fact-checking them to point out their lies as has been done here.

It is a sad indictment of the shoddy state of journalism today.

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