We carried out this research as part of the University of Oxford's Reuters Institute annual Digital News Reports. More than 80,000 people were surveyed online in January and February of this year.
Almost seven in ten think climate change is "a very, or extremely serious, problem", but the results show notable country differences. Lack of concern is far higher in the US (12 percent) as well as in Sweden (9 percent), Greta Thunberg's home country.
Despite disastrous bush fires at the time of our fieldwork, 8 percent of respondents in Australia report that climate change is not serious at all. These groups with low levels of concern tend to be right wing and older.
Four of the five countries showing the highest levels of concern (85-90 percent) were from the global south, namely Chile, Kenya, South Africa and the Philippines. However, in countries with lower levels of internet penetration, our online survey samples over-represent people who are more affluent and educated.
Above: Almost everyone in Chile and Kenya thinks climate change is serious. But that's not the case in Scandinavia and the Low Countries.
Perhaps surprisingly, the five countries with the lowest levels of concern are all in Western Europe. In Belgium, Denmark, Sweden, Norway and the Netherlands, only around half (or less) think that climate change is a serious problem.
It is the first time that results from survey questions on climate change have been included in the Reuters Institute's reports, so it is difficult to draw out historical trends. However, results in 2015 from the Pew Center based on surveys in 40 countries (with different questions and countries to those in our survey) found that 54 percent of those surveyed thought that climate change was "a very serious" problem.
So it looks like concern for climate change may be rising globally. There is certainly strong evidence that it is increasing in some countries. In the US, in November 2019 two in three Americans (66 percent) said they were at least "somewhat worried" about global warming, an increase of 10 percentage points over the past ﬁve years.
In the UK, data from the CAST centre at Cardiff University showed that in 2019 levels of "worry" about climate change were at their highest recorded point. Extreme weather events, media reporting and wider publicity were mentioned by respondents as reasons for their increase in concern.
In our survey, across countries and markets, individuals who identify as left-wing tend to report higher levels of concern. This finding is even more visible in more polarised societies such as the US where 89 percent of those who self-identify on the left note that climate change is serious, compared to only 18 percent of those who self-identify on the right.
We also find a similar divide in Sweden. As Sweden is widely considered one of the world's most progressive nations, these results surprised us and we asked Martin Hultman, a researcher in climate denialism at Chalmers University in Gothenburg, what to make of them.
"These figures do not surprise me", he told us in an email. "Since 2010, the leadership of the far-right political party Sweden Democrats has been against all types of policies to tackle climate change, including the Paris Agreement."
"And we know that the spread of climate change denial ideas and rhetoric is widespread in Sweden – not least when digitally-born far-right media sites spread conspiracy theories about Greta Thunberg."
TV news still dominates
Across all countries, people say they pay most attention to climate news on television (35 percent). Online news sites of major news organisations are the second most popular news source (15 percent), followed by specialised outlets covering climate issues (13 percent), then alternative sources such as social media and blogs (9 percent).
Figures from the UK, US and Australia are broadly in line with these preferences. Printed newspapers and radio are way down, with only around 5 percent saying each was the source they paid most attention to.
In Chile, where the concern is high, specialised outlets covering climate issues (24 percent) as well as alternative sources such as social media (17 percent) are nearly as popular as television (26 percent).
The differences in climate news consumption are also visible among different age groups. Younger generations, more specifically the so-called Generation Z (aged 18-24), are more likely to report paying attention to alternative sources on climate change (17 percent) as well as TV (23 percent) and online news sites from major news organisations (16 percent).
Older people, however, rely more heavily on TV (42 percent) and use less of the online news sites (12 percent) or alternative sources such as social media (5 percent).
Respondents from both sides of the political spectrum criticise the media for either being too doom-laden, or not bold enough, in their coverage of climate change. That said, our survey shows that almost half of our respondents (47 percent) think that news media generally do a good job of informing them about climate change, and 19 percent think that they do a bad job.
However, those who have low levels of concern are much more inclined to say that the news media are doing a bad job (46 percent). This might indicate a lack of trust in climate change coverage or a more general loss of confidence in the news media.