A claim has been that 97% of
the scientific literature endorses anthropogenic climate change (Cook et
al., 2013. Environ. Res. Lett. 8, 024024). This claim, frequently
repeated in debates about climate policy, does not stand. A trend in
composition is mistaken for a trend in endorsement. Reported results are
inconsistent and biased. The sample is not representative and contains
many irrelevant papers. Overall, data quality is low. Cook׳s validation
test shows that the data are invalid. Data disclosure is incomplete so
that key results cannot be reproduced or tested."
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