Blame
Global Warming for Your Bad Attitude
Climate
change is making us angry. It may also cause more assaults, murders,
and even poor math grades for your kids.
Eric Roston
September 8, 2016
It doesn’t take a
PhD to see that climate affects our lives. Anyone who lives far
enough from the equator can tell just by opening the closet.
It takes a lot of
scientists, however, to reveal how climate affects us—particularly
as our climate changes. Sure, there’s prolonged heat and drought in
some places, persistent floods and storms in others—all the ways
we’ve learned to see global warming (though some still reject the
science). But an exhaustive review of almost 200 different studies
reveals not only the extent of those predictable changes but also how
we humans are reacting to climatic wallops. The results are
troubling.
Richard Moss, senior
scientist at Pacific Northwest National Laboratory’s Joint Global
Change Research Institute, calls the study essential to making clear
the everyday price of climate change. Moss, who led the climate
division of the U.S. Global Change Research Program and contributes
to the National Climate Assessment, said “it’s always been a
challenge in some of our national conversations.”
Thinkers at least as
old as Aristotle asked how climates shape societies, the authors of
the new analysis note. The trouble with answering that question in a
thorough manner is that scientists would have to measure pretty much
everything all the time. This new super study, published Thursday in
the journal Science, shows that scientists have become extremely
clever at drawing conclusions by combining data they have with novel
statistical approaches.
In their analysis,
researchers at the University of California at Berkeley deployed
these tools to assess the societal consequences of climate change.
They lend support to earlier conclusions on how it’s slowing global
economic growth (by 0.25 percentage points every year) and has raised
the risk of conflict in Africa (by 11 percent since 1980). But there
are other, less predictable impacts as well.
1. What an
“adaptation gap” looks like
One thing science
has brought to agriculture is a more precise understanding of how
crops perform at specific temperatures and at vital stages of their
growth cycles. If any country can insulate itself from the shocks of
warming, it’s probably the U.S. Yet even among American farmers,
studies have concluded that plenty of adaptation are needed,
particularly in the South. The chart below left shows that the South
and Central U.S. have a greater sensitivity to higher temperature
than in the North—possibly in part a function of crop insurance
distorting incentives to adapt. The chart on the right projects corn
behaving somewhat similarly in both slow and fast warming scenarios.
“It's a big
mystery,” said Solomon Hsiang, who along with Tamma Carleton
authored the new paper. “In some locations, we see really high
levels of adaptation, and in other places we see nothing.”
SOURCE: Tamma
Carleton and Solomon Hsiang; journal Science
2. Heat disrupts
human reproduction
Higher temperatures
affect human sexual behavior, the researchers found. Birth rates drop
nine months after heat spells, bouncing back reliably nine months
after the heat breaks. In this case, the adaptation is a delay,
rather than a decline, in regular patterns.
A decline in births
nine months after hot spells tends to be followed by a rebounding
rise in average births.
A decline in births
nine months after hot spells tends to be followed by a rebounding
rise in average births.
SOURCE: Tamma
Carleton and Solomon Hsiang; journal Science
3. More storms may
mean more infant mortality
Cyclone damage is
bad enough, leaving poor communities broken and without resources to
recover. In the Philippines, data suggest that in the months after a
major storm, female infant mortality leaps. In the post-storm
dislocation, when the local economy is thrashed and everything and
everyone needs help or attention, infant girls may receive among the
least of it. The infant-female mortality rate is twice as high in
families where there is an older sibling, and twice as high as that
in families where the older sibling is male, Hsiang said.
The mortality rate
of female infants rises dramatically in the months after the
Philippines faces a tropical cyclone.
The mortality rate
of female infants rises dramatically in the months after the
Philippines faces a tropical cyclone.
SOURCE: Tamma
Carleton and Solomon Hsiang; journal Science
4. People secretly
hate heat
It’s easy to
imagine that warmer weather might make people happier. After all,
summer brings beaches and bikes, and hiking and barbecues.
That may not be the
case, according to a 2014 paper [pdf] that analyzed a billion Twitter
posts and scored them across a happiness index. Above 70 degrees
Fahrenheit or so, the mood of Twitter users changed, evidenced in
part by an uptick in profanity. The difference in user happiness
scores during 60F to 70F weather and 80F to 90F weather was similar
to the difference in people’s moods on Sundays vs. Mondays.
A 2015 analysis of a
billion tweets concluded that heat makes people upset, with a
detectable uptick in profanity as temperature rose above about 70
degrees Fahrenheit.
A 2015 analysis of a
billion tweets concluded that heat makes people upset, with a
detectable uptick in profanity as temperature rose above about 70
degrees Fahrenheit.
SOURCE: Tamma
Carleton and Solomon Hsiang; journal Science
It may sound
frivolous, but the Twitter study opens up a critical question for
projections of economic damages from climate change. If
climate-economic models assume that warmer temperatures bring better
living, but it turns out that they now bring frustration and
short-tempers, current estimates of future economic damages may be
low by a considerable margin.
5. Heat and violence
may be linked
A 2014 study in the
Journal of Environmental Economics & Management drew attention by
comparing increases in violent crime in the U.S. to the rate of
global warming and concluding that “temperature has a strong
positive effect on criminal behavior.” The analysis was based on 30
years of monthly crime and weather statistics for almost 3,000 U.S.
counties. The researcher contends that, if the same pattern holds, by
the end of the century there will be an additional 22,000 murders,
180,000 cases of rape, 1.2 million aggravated assaults, 2.3 million
simple assaults, 260,000 robberies, 1.3 million burglaries, 2.2
million cases of larceny, and 580,000 cases of vehicle theft.
6. A brand new
excuse for bad math grades
In an episode of the
long-running urban drama The Wire, a school principal subdues unruly
middle schoolers by turning up the heat in classrooms, making them
too tired to be rambunctious. It's not a flight of fancy: Children’s
math test performance drops as temperatures rise, making the question
of which classrooms have air conditioning an issue not only of
comfort but also of academic performance.
SOURCE: Tamma
Carleton and Solomon Hsiang; journal Science
7. The big whopper
Climate change
currently retards potential economic growth by about 0.25 percent a
year, every year. Future warming may bring an additional 0.28 percent
slowdown annually. Different national economic responses to rising
temperatures document the same pattern: “If someone asked me which
keeps me awake at night,” Hsiang said, “that’s the thing.”
SOURCE: Tamma
Carleton and Solomon Hsiang; journal Science
8. It’s not just
about us
Carleton and Hsiang
focused on an enormous yet limited task: How does climate affect
society? A different paper published Thursday in Science asks how the
nonhuman world may fare. A team led by Mark Urban of the University
of Connecticut reports a lot of work is needed to assess how climate
change affects biodiversity. But it’s pretty clear that making sure
plants, animals, and microbes are happy in a human-altered ecosystem
isn’t just about keeping them healthy: It’s a critical to our
survival, too.
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