As the global spotlight turns to the Murujuga Cultural Landscape, which the World Heritage Committee is currently considering for listing, two contrasting scientific reports have sparked a wider debate about how best to assess and protect one of the world's oldest and most culturally significant sites.
A recently released PhD study by a researcher at the University of Bonn in Germany has raised concerns that industrial emissions on the Burrup Peninsula may be accelerating the degradation of the Murujuga rock art. The research was conducted over three years in a laboratory setting and used artificial rainfall and climate simulations to test how acidification affects the chemical composition of rock varnish, particularly manganese oxides, which are the key component of the dark patina that gives the petroglyphs their visibility.
The study was carried out off-site, without fieldwork on Country or engagement with the Traditional Owners of Murujuga. The samples analysed in the study were collected in 2022 and compared to older rock samples obtained in 1994. The findings suggest that manganese has been leaching from the surface at a faster rate in recent years, potentially indicating long-term chemical erosion linked to air pollution. These conclusions have been welcomed by some activist groups who have criticised the Federal Government's approval of major industrial projects in the region.
In contrast, the Murujuga Rock Art Monitoring Program (MRAMP), established in 2019 and governed by the Murujuga Aboriginal Corporation, has consistently found no conclusive evidence linking current industrial activity to visible damage to the rock art. Unlike the laboratory-based Bonn study, MRAMP is a comprehensive field monitoring initiative. It was developed in partnership with Traditional Custodians, state and federal governments, and leading scientists. It includes regular on-Country sampling, analysis of environmental data, and photographic and spectroscopic documentation across multiple monitoring sites.
MAC chairperson Peter Hicks said: "The science that's been put into this is led by our senior scientist Ben Mullins and a team of 55 experts from across the world to put this science together. The science shows that there's no acid rain or effect on our rock art currently and therefore the scaremongering of third parties out there trying to destroy the dreams of our people is absolutely unacceptable."
MRAMP employs 55 independent scientists and actively engages MAC Rangers in collecting and interpreting data. The program has recorded variations in surface pH across certain locations, but no consistent correlation has been found between acidity levels and changes in rock surface condition. Instead, MRAMP has concluded that current weathering rates remain low and within expected natural parameters.
Mr Hicks said the MRAMP findings provide a robust and balanced picture of the site's condition and reaffirm the importance of grounding environmental monitoring in Traditional Knowledge and local expertise
"The science needs to be looked at and respected," he said, "but we also need to understand that this is a living cultural landscape, not just a laboratory subject. The work we're doing on Country is ongoing, thorough, and culturally informed."
MAC chief executive Wayne Stubbs echoed this sentiment during the delegation's attendance at the World Heritage Committee meeting in Paris, saying the Corporation remains positive and confident that Murujuga will soon join the UNESCO list.
"This is the next stage in the journey. We've got strong science, strong governance, and strong cultural leadership. The Traditional Custodians are at the centre of this work," he said.
The World Heritage nomination for Murujuga is supported by the representatives of the five Traditional Owner groups of the region: the Yaburara, Mardudhunera, Ngarluma, Yindjibarndi and Wong-Goo-Tt-Oo peoples. It has been advanced through a decade-long process involving both scientific and cultural assessments. Custodians travelled to Paris this month to participate in the final stages of the nomination, alongside senior Australian officials and Environment Minister Murray Watt, who has engaged in direct diplomatic efforts to secure support from voting nations.
The divergence between the University of Bonn study and the MRAMP report reflects more than just differing conclusions. It illustrates a fundamental distinction in methodology. While the Bonn research is based on worst-case simulations using artificial rainfall and laboratory conditions, MRAMP measures real-time environmental change at actual heritage sites under real-world conditions. The German study offers valuable insights into possible long-term risks, but lacks contextual information about Murujuga's geology, climate patterns, and cultural significance.
Critics of the Bonn study could argue that framing Murujuga as already severely degraded risks undermining the case for World Heritage listing, which depends in part on demonstrating that the site retains its integrity and authenticity. It is also arguable that using localised findings to make broad claims may misrepresent the current overall health of the landscape.
For Traditional Owners and their partners in MRAMP, the focus remains on maintaining vigilance, transparency, and culturally respectful stewardship. As Mr Hicks put it: "Murujuga has always been a place of stories, law and connection. Our people have been protecting it for tens of thousands of years, and we will continue to do so through strong culture and strong science, working together."
With a decision expected soon from the UNESCO World Heritage Committee, the eyes of the world are now on Murujuga.
