news coverage of 10 science and economic policy issues on which there’s clear consensus, he discovered “information related to expert consensus is contained in an extremely small portion of a news consumer’s diet on these issues.” He examined nearly 300,000 news articles and transcripts from six national and local newspapers, three cable news networks, three TV news networks and the Associated Press newswire service going back to 1980. His research finds that news outlets do a poor job informing the public about the scientific consensus on hot-button issues such as vaccination, nuclear power and genetically modified foods - even when it’s directly relevant to their coverage. When a reporter interviews a source whose views match the collective position, it’s a strong signal the information is trustworthy, explains Eric Merkley, an assistant professor of political science at the University of Toronto who studies expert consensus. Knowing what experts think about an issue can help the public make informed decisions about it. Surveys of physicians and medical researchers “have repeatedly indicated that over 90% of doctors agree that adults and children should receive all recommended vaccines,” according to a paper published in 2016 in the medical journal BMJ Evidence-Based Medicine. For example, the overwhelming majority of doctors say childhood vaccines are safe. Scientific consensus is the collective position scientists in a given field have taken, based on their interpretation of the available evidence.
This tip sheet features practical advice from three researchers with expertise on those topics. If you’re unsure what scientific consensus is, don’t understand its significance or have no idea how to gauge it, keep reading. When reporting on controversial policy topics such as vaccine safety and climate change, journalists can look to scientific consensus to bolster their coverage and battle misinformation.
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