“We have shown that the onset of partisan polarization occurs early in the life cycle with very little change thereafter. Today, high levels of in-group favoritism and out-group distrust are in place well before early adulthood.” (1/x) marginalrevolution.com/marginalrevolu…
“In fact, our 2019 results suggest that the learning curve for polarization plateaus by the age of 11.”
“This is very unlike the developmental pattern that held in the 1970s and 1980s, when early childhood was characterized by blanket positivity toward authority figures and partisanship gradually intruded into the political attitudes of adolescents before peaking in adulthood.”
“50 years ago, political socialization was thought to play a stabilizing role important to democratic norms and institutions. In particular, children’s adoption of uncritical attitudes toward authority figures helped to legitimize the entire democratic regime.”
“In the current era, it seems questionable whether the early acquisition of out-party animus fosters democratic norms and civic attitudes.”
“Extreme polarization is now associated with rampant misinformation, and, as indicated by the events that occurred in the aftermath of the 2020 election, with willingness to reject the outcome of free and fair electoral procedures.”
“The question for future research is how to transmit party attachments, as occurred in the pre-polarization era, without the accompanying distrust and disdain for political opponents.” (X/x)

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More from @dwallacewells

7 Sep
In today's piece, @DLeonhardt makes the case for vaccines by usefully clarifying the risk of breakthrough infections (he estimates daily risk at 1-in-5,000). But he doesn't mention the equivalent risk for the unvaccinated (during Delta, probably 1-in-1,000). A short thread (1/x)
@DLeonhardt Five-fold is a meaningful reduction of risk, of course, though it is much less significant than the demonstrated effect of vaccines on hospitalization (last week, the CDC suggested in L.A. vaccinations had reduced those risks almost 30-fold). cdc.gov/mmwr/volumes/7…
@DLeonhardt As @DLeonhardt implies, the vaccines are remarkably effective at their most important job, preventing severe disease, hospitalization, and death. They are by far our best tool in blunting the severity of the ongoing pandemic.
Read 7 tweets
6 Sep
“Ahead of these pivotal meetings, we call for urgent action to keep temperature increases below 1·5°C, halt the destruction of nature, and protect health.” An editorial published simultaneously by many of the world’s leading health journals. (1/x) thelancet.com/journals/lance…
“Targets are easy to set and hard to achieve. They are yet to be matched with credible short-term and longer-term plans to accelerate cleaner technologies and transform societies.”
“Concern is growing that temperature rises above 1·5°C are beginning to be seen as inevitable, or even acceptable, to powerful members of the global community.”
Read 6 tweets
25 Aug
“We have vaccine abundance in the United States but not test abundance. Germany has test abundance. Tests are easily available at the supermarket or the corner store and they are cheap, five tests for 3.75 euro or less than a dollar each.” marginalrevolution.com/marginalrevolu…
“In Great Britain you can get a 14 pack for free. The Canadians are also distributing packs of tests to small businesses for free to test their employees.”
“In the United States, the FDA has approved less than a handful of true at-home tests and, partially as a result, they are expensive at $10 to $20 per test, i.e. more than ten times as expensive as in Germany.”
Read 5 tweets
23 Aug
“At least 22 people have been killed and more than two dozen others remain missing on Sunday after a catastrophic flash flood swept through a rural area of rivers, creeks and rolling woods about 90 minutes west of Nashville, the authorities said.” (1/x) nytimes.com/2021/08/22/us/…
“The floodwater vanished as quickly as it arrived, and left in its wake was a bewildering display of its fury and strength in a collection of rural communities in and around Humphreys County.”
“Homes had been picked up off their piers and dropped across the street. Bridges and roads were crumbling. Cars were mangled and trucks had been turned upside down. Chain-link fences were clogged with debris, evidence of when they were a dredge for a spontaneous river.”
Read 11 tweets
22 Aug
“In all, roughly 40 million people from California to Wyoming to Mexico depend on the Colorado River for their lives and livelihoods. And it’s starting to run dry.” (1/x) bloomberg.com/news/features/…
“Last week, the U.S. Bureau of Reclamation made official the crisis at Lake Mead, a reservoir formed by the Hoover Dam and one of the most visible signs of the river’s decline. The water level now sits about 1,068 feet above sea level, close to 200 feet below its typical level.”
“With the announcement came cuts to CAP’s water supply. Early next year, supply will drop 30%.”
Read 5 tweets
22 Aug
“Deforestation in the Brazilian Amazon has hit the highest annual level in a decade, a new report has shown, despite increasing global concern over the accelerating devastation since President Jair Bolsonaro took office in 2019.” (1/x) theguardian.com/environment/20…
“Between August 2020 and July 2021, the rainforest lost 10.476 square kilometers – an area nearly seven times bigger than greater London and 13 times the size of New York City, according to data released by Imazon, a Brazilian research institute.”
“The figure is 57% higher than in the previous year and is the worst since 2012.”
Read 6 tweets

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