The BBC documentary ‘Blue Planet II’ raised environmental awareness, but may not have discouraged people from choosing plastic, according to new research.
Blue Planet II, broadcast in 2017, included messages about the human impact on the oceans, including the growing problem of plastic pollution. This was largely credited with creating a ‘Blue Planet effect’, which included people choosing to consume less plastic.
Now, an experiment by Imperial College London and the University of Oxford suggests that while watching the documentary increased environmental awareness in a group of volunteers, this did not ‘translate’ into choosing to use fewer single-use plastics.
The findings from our experiment are counter to the popular idea that Blue Planet II reduced viewers’ preference for plastic
The results have been published in Conservation Science and Practice.
First author Matilda Dunn, from the Centre for Environmental Policy at Imperial, said: “The findings from our experiment are counter to the popular idea that Blue Planet II reduced viewers’ preference for plastic, instead demonstrating that human behaviours are complex and determined by more than just knowledge.
“However, Blue Planet II may have had a wider impact by increasing conversations around ocean plastic pollution, allowing the topic to become more politically palatable.”
Blue Planet effect
To find out whether Blue Planet II changed people’s plastic-choice behaviour, the team conducted an experiment with 150 people split into two groups.
Both groups completed a questionnaire that measured their understanding of and attitudes towards marine conservation issues.
One group was then shown the original The Blue Planet documentary, which aired in 2001 and contained no plastic or ocean conservation messages. The other group was shown Blue Planet II. After the viewings, both groups filled in the same questionnaire.
We are the first to use this type of experimental design along with measuring observed behaviours to test the hypothesis.
Before and after both showings, participants were also offered a choice of drinks and snacks, either in paper or plastic packaging, and noted which participants chose.
The team controlled for any other differences between the options, such as flavours or sizes of the snacks, for example by offering the same soft drinks in both plastic and paper cups.
No significant difference
While watching Blue Planet II greatly increased understanding of marine conservations issues as revealed by the questionnaires, there was ‘no significant difference’ in the choices people made between plastic and paper-packaged snacks.
Co-author Dr Morena Mills, from the Centre for Environmental Policy at Imperial, said: “Many previous studies of people’s preference for plastic rely on individuals reporting their own preference, which can be unreliable.
“We are the first to use this type of experimental design along with measuring observed behaviours to test the hypothesis.”
The researchers are planning to use this evaluation method to test the effectiveness of other conservation-related mass media interventions on changing individual behaviours.