New York Times' Global Warming Article Is Mostly Guesswork, Actual Temps Lower

  • Another week, another New York Times feature trying to get their readers to worry about how much the world could warm in the future.

This time NYT partnered with the Climate Impact Lab, which is “a group of climate scientists, economists and data analysts from the Rhodium Group, the University of Chicago, Rutgers University and the University of California, Berkeley,” the paper noted.

NYT and Climate Impact Lab created a graphic that’s supposed to show readers how many more days at or above 90 degrees Fahrenheit they could expect today in their home town from when they were born — their data only goes back to 1960, though.

The question is: how accurate is NYT’s representation of the change in days at of above 90 degrees? Well, at least for U.S. cities, it seems to be misleading.

“This is [a] waste of time,” quipped Dr. Ryan Maue, a Cato Institute adjunct scholar, in a tweet sent out Sunday night. Maue ran the numbers for Atlanta and got a different answer than what NYT showed for the city.

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Here’s what NYT told showed readers who grew up in Atlanta:

Source: Screenshot of The New York Times taken 9/2/2018

So, why is there a difference between the observed record and what NYT reports?

Do you think NYT is trying to scare readers?

One reason is because NYT uses a “21-year rolling average” to tell readers how many hot days they could expect the year they were born — not the actual number that were observed.

The second reason is because NYT’s data past 2000 is blended with a climate model tuned to future climate projections. After 2020, The Times notes, “the data uses a mixed climate model that captures a broad range of extreme temperature responses.”

“The future projection shown here assumes countries will curb greenhouse gas emissions roughly in line with the world’s original Paris Agreement pledges,” NYT notes.

What’s also apparent is the starting point for NYT’s data is in 1960 at the beginning of a rash of years with relatively few days with soaring temperatures. By starting their data in 1960, NYT ignores the decades before with a number of 90 degree days on par with today.

However, NYT uses this model-blended data to claim Atlanta “is likely to feel this extra heat even if countries take action to lower their emissions by the end of the century.” The paper quotes experts who warn that human health and agriculture will suffer as a result.

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“If it’s also humid, humans can’t physiologically evaporate sweat as easily, and we can’t cool down our bodies effectively,” Climate Impact Lab’s Kelly McCusker told The Times.

“Food, water, energy, transportation, and ecosystems will be affected both in cities and the country. High-temperature health effects will strike the most vulnerable,”  echoed the group’s leader Cynthia Rosenzweig, a scientist at the NASA Goddard Institute for Space Studies.

While future warming is up for debate, what’s not is the historical record. NYT’s model-blended temperature charts cities around the country, however, doesn’t seem to reflect the actual number of days at or above 90 degrees Fahrenheit — at least in the U.S. where we have a robust temperature record.

Maue also examined station data from Washington, D.C. and, again, found it looked nothing like NYT’s ominous graphic showing a drastic increase in the number of hot days people can expect.

Again, notice that NYT’s starting date of 1960 is around a low point in the number of 90 degree of higher days. D.C.’s data only goes back to 1940, so it’s not as long as many other thermometers in other cities.

If NYT wanted to exaggerate a trend towards more 90 degree or hotter days, then starting in 1960 would accomplish that, but doing so ignores the warm period during the 1930s. In fact, the latest National Climate Assessment report noted the “Dust Bowl era of the 1930s remains the peak period for extreme heat.”

That heat is also evident in heat wave data presented by the Environmental Protection Agency. No other decade even comes close to the 1930s in terms of the heat wave index.

Source: U.S. Climate Change Science Program, U.S. Environmental Protection Agency

Readers should use NYT’s temperature tool to check out modeled trends for their own home towns, then compare it to observed temperature data. The results could be surprising.

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