By Eduardo Porter
Tuesday, April 19, 2016
Are liberals impairing our ability to combat climate
change?
That may sound like a strange question, particularly to
readers of The New York Times. Today conservatives are the ones decidedly
blocking any effort by the United States to curb its emissions of greenhouse
gases.
And yet even as progressive environmentalists wring their
hands at the G.O.P.’s climate change denial, there are biases on the left that
stray just as far from the scientific consensus.
“The left is turning anti-science,” Marc Andreessen, the
creator of Netscape who as a venture capitalist has become one of the most
prominent thinkers of Silicon Valley, told me not long ago.
He was reflecting broadly about science and technology.
His concerns ranged from liberals’ fear of genetically modified organisms to
their mistrust of technology’s displacement of workers in some industries. “San
Francisco is an interesting case,” he noted. “The left has become reactionary.”
Still, liberal biases may be most dangerous in the
context of climate change, the most significant scientific and technological
challenge of our time. For starters, they stand against the only technology
with an established track record of generating electricity at scale while
emitting virtually no greenhouse gases: nuclear power.
Only 35 percent of Democrats, compared with 60 percent of
Republicans, favor building more nuclear power plants, according to a poll by
the Pew Research Center.
It is the G.O.P. that is closer to the scientific
consensus. According to a separate Pew poll of members of the American
Association for the Advancement of Science, 65 percent of scientists want more
nuclear power too.
Ted Cruz’s argument that climate change is a hoax to
justify a government takeover of the world is absurd. But Bernie Sanders’s
argument that “toxic waste byproducts of nuclear plants are not worth the risks
of the technology’s benefit” might also be damaging.
Highlighting the left’s biases may seem like a pointless
effort to apportion equal blame along ideological lines. But it is critical to
understand how they have come into being. It suggests how difficult it will be
to overcome our scientific and technological taboos.
Research suggests that better scientific knowledge will
not be sufficient, on its own, to overcome our biases. Neither will it be
mostly about improving education in STEM fields. To defeat our scientific
phobias and taboos will require understanding how the findings of science and
their consequences fit into the cultural makeup of both liberals and
conservatives.
Joel Mokyr at Northwestern University, an expert on the
history of science and technology, notes that the ease with which people accept
scientific knowledge depends on how straightforward the proof is.
Einstein’s theory of relativity was readily accepted
despite the fact that few people understood it because there were a couple of
experimental results no other theory could explain. Natural selection is
trickier.
“It is awfully hard to find a smoking gun” to prove
evolution, Professor Mokyr told me. “This is by definition because the process
is so slow.”
The evolution of scientific knowledge is messy, too. It
does not neatly converge on truth along a smooth line, but rather jumps around
as new knowledge disproves old certainties. Scientists’ understanding of the
speed, intensity and implications of climate change is substantially different
from what it was only a couple of decades ago.
But perhaps the most important snag to the diffusion of
scientific knowledge is motivation. The average American has little at stake
riding on whether the general theory of relativity is right or not. Evolution,
by contrast, is a body blow to evangelical Christians’ worldview.
Only 48 percent of respondents agree with the proposition
that humans evolved from other beings, according to the General Social Survey,
a broad survey of American attitudes and beliefs. But when the question is
prefaced with the qualifier “according to the theory of evolution,” agreement
with the proposition rises to 72 percent.
Responses aren’t necessarily driven by ignorance. “Where
there is a sacred value that empirical science contradicts,” science will have
trouble making headway, notes Jonathan Haidt, a social psychologist at the
Stern School of Business at New York University.
And the value doesn’t even have to be sacred.
A few years back, Dan Kahan of Yale Law School, Hank
Jenkins-Smith of the University of Oklahoma and Donald Braman of George
Washington University Law School performed experiments testing how values
affected people’s agreement with scientists about climate change, the disposal
of nuclear waste and allowing concealed possession of handguns.
“The problem, it seems, is not that members of the public
are unexposed or indifferent to what scientists say,” they concluded. “They
disagree about what scientists are telling them.”
People identified as more egalitarian and more open to
government interventions to address social ills — the left, as it were — were
much more likely to say that most scientists agree global warming is happening
and that it is caused by human activity. Most also said scientists either
disagreed or were divided on the safety of storing nuclear waste.
On the right, people identified as individualistic and
wary of Big Government responded differently: In their view, the scientific
consensus said the opposite. How could they think that? They manufactured the
expert consensus they wanted by defining as experts only those who agreed with
their ideological position.
It is not hard to figure out the biases. People on the
right tend to like private businesses, which they see as productive job
creators. They mistrust government. It’s not surprising they will play down
climate change when it seems to imply a package of policies that curb the
actions of the former and give a bigger role to the latter.
On the left, by contrast, people tend to mistrust
corporations — especially big ones — as corrupt and destructive. These are the
institutions bringing us both nuclear power and genetically modified
agriculture.
“When science is aligned with big corporations the left
immediately, intuitively perceives the technology as not benefiting the greater
good but only benefiting the corporation,” said Matthew Nisbet, an expert on
the communication of science at Northeastern University.
So when assessing the risks of different technological
options, the left finds the risk of nuclear energy looming the highest, regardless
of contrary evidence.
This doesn’t affect only beliefs about climate change and
energy policy. The research identified similar distortions in people’s beliefs
about the scientific consensus on the consequences of allowing concealed
handguns. Biases also color beliefs in what science says and means across a
range of other issues.
In the context of climate change, this heuristic presents
an odd problem. It suggests that attitudes about climate change have little to
do with education and people’s understanding of science.
Fixing it won’t require just better science. Eliminating
the roadblocks against taking substantive action against climate change may
require somehow disassociating the scientific facts from deeply rooted
preferences about the world we want to live in, on both sides of the
ideological divide.
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