People of a certain age remember radio and television broadcasts interrupted by tests of the Emergency Broadcast System.
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When emergency alerts are hard to distinguish from text messages and when they announce the availability of vaccines rather than an impending tornado, are they still emergency alerts?
Google search histories can be used to reveal how much the public knows about climate change in countries all over the world - and how ready they are to take action to guard against its effects.
Positive messaging wins the day.
AAP Image/Dallas Kilponen
Plastic bags will soon be gone from major supermarkets and many other shops too. Campaigns to reduce plastic even more should focus on positive advice, rather than shaming shoppers for their plastic use.
Everyone knows that plastic waste is an environmental problem. So let’s get creative with it.
Giving up alcohol for a month might help you feel better in the short term, but no-one knows if taking part in these campaigns promotes long-term healthy drinking habits.
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Many of us might be tempted to give up alcohol for a month as part of a highly publicised campaign, like Dry July. But how successful are these campaigns and how do you measure any long-term benefits?
Anosmia prevents people from smelling any odors.
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