Defence personnel not allowed to speak about climate ‘unless they go through Peter Dutton’s office’

The former chief of the defence force Chris Barrie says defence personnel are not allowed to speak out on the national strategic threats posed by climate change without prior approval from Peter Dutton's office.

The suggestion was immediately rejected by the defence minister's office. Asked for comment, the minister's spokesperson said: "That is not correct."

Barrie is the Australian chair of the Global Military Advisory Council on Climate Change and authored the 2015 report Climate Change, Security and the ADF.

He made the remarks while addressing the 2022 Fenner conference on sustainable agriculture in Canberra, where he outlined the security threats Australia faced as a result of global warming.

Barrie said when he lectured on the threats caused by climate change in the defence headquarters in Canberra, they were filled with attendees interested in the subject.

"Most of them would like to be out there speaking but they're not allowed to unless they go through Peter Dutton's office," Barrie said.

"These people live in our community, they are part of our community and they understand what is going on.

"I think it's a disgrace that we've made a left-right issue out of climate change, or global warming and its impact, because frankly, we are all on planet Earth.

The executive director of the Australian Defence Association, Neil James, said there were very few military, academic or civilian strategic security analysts who did not consider climate change a serious problem.

But there was an important principle for defence personnel staying out of politics.

"The last thing you want is your defence force involving themselves in politics," James said.

"If you want to keep the gun out of politics, you want to keep politics out of the gun. It's actually a principle. That's why you have an institutionally non-partisan defence force."

James said the reason there were "not too many climate deniers" in the strategic security sector is because it was a science-based discipline.

"But it's also one very much informed by history. And you've only got to look at history to know the effects climate has on various things.

Barrie described the coming federal election as the most important of his lifetime and urged the audience to demand "full disclosure" of all politicians regarding their plans in office.

"A return in my view to a proper version of Westminster system should see the best candidate in every seat return. I hope there will be many more women in the next parliament too and maybe then we will see the leadership we urgently need," Barrie said.

Barrie said the "elephant in the room was global population", with projections of 10 billion people by 2050, which he described as the "maximum carrying capacity".

Barrie suggested the ideal population for the planet was one and a half to two billion people, quoting scientists such as Prof Paul Ehrlich.

And he urged the federal government to consider a comprehensive nationwide climate and security risk assessment to expose vulnerabilities and create a sound basis for decision-making and priorities, including an integrated plan for the allocation of resources.

He called for Australia to work within the region to understand climate change-related food shocks and the security consequences that came with those disruptions.