I heard a commentator recently describe Americans as living
in silos. They get their news from their
favorite source, and it is their favorite source because it tells them
something they already believe. They
choose their friends based on how much they agree with them. They “un-friend” those on social media who
disagree with their own world view. They
just live in the silo where everything is peaceful and calm, where there is
never conflict or disagreement, but where also there is no longer any growth or
learning. The point of the comment was
politics, but these days everything is politicized and the comment can easily
be extended to all aspects of life and daily decisions. This activity of believing what is
comfortable and consistent with current beliefs and rejecting or ignoring what
is not, is known as confirmation bias.
Here is another example of the kind of information that will
be accepted by some and rejected out of hand by others. NBC reports that the European Food Safety
Authority (EFSA) said glyphosate, the active ingredient in Roundup, was
unlikely to cause cancer in humans. Now
policymakers in Europe must decide whether to extend the current approval
period beyond the end of the year. This
comes while environmental groups have been calling for a ban and some
businesses have begun to limit its use.
But the EFSA spokesman says: "This
has been an exhaustive process - a full assessment that has taken into account
a wealth of new studies and data…unlikely that this substance is
carcinogenic."
EFSA scientists worked with experts from EU member states
and focused specifically on glyphosate, whereas the study supporting the environmentalists’
objections assessed groups of related chemicals. Therefore, the findings of toxicity could be
related to the other chemicals or some interaction.
What is interesting in this case is that the EU is typically
far less tolerant than the US when it comes to environmental issues, choosing
to err on the side of extreme caution, for example their stance on GMOs. Therefore, for them to make a statement
exonerating (in a sense) Roundup is more significant than if it came from
another source. (This information is not
inconsistent with my Master Gardener training which does not discourage the use
of glyphosate, as long as it is used for the proper purpose according to the
label instructions.)
Nevertheless, some groups will dismiss this report out of
hand. The great thing about confirmation
bias is that it requires no evidence. In
fact when you disagree, evidence becomes a nuisance.
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