Greta Thunberg summed up 2019 in five words: “Our house is on fire.” In Australia, this is now literally the case.

Wildfires there have been raging for more than a month and now span an area larger than Switzerland. The situation bears all the hallmarks of a hot new world: lives lost, livelihoods ruined and species pushed towards extinction, accompanied by government inaction, industry PR spin, abetting rightwing echo chambers, and taxpayers footing the multibillion-dollar bill.

Insanely, the Australian government remains in denial – ignoring the science, downplaying the seriousness and subservient to coal. The fossil fuel industry, meanwhile, is busy greenwashing and gaslighting: Chevron is boasting about its $1m donation – 0.00667% of its annual earnings – to the Australian Red Cross, and Exxon Australia just wants everyone to “Stay safe and have fun”. All this is set to a backdrop of mutually reinforcing rightwing new outlets, online bots and trolls, which are distracting and misinforming the public about the science and politics of climate-catalyzed fires.

Exxon has misled Americans on climate change for decades. Here’s how to fight back Read more

The charity of everyday people (and some celebrities) rising to meet the disaster has been inspiring and essential. Yet, tragically, it also unintentionally serves to reinforce the false narrative, perpetuated by fossil fuel propagandists, that we are all equally to blame.

In reality, today’s climate chaos is big oil’s legacy, not ours. Unlike the rest of us, the fossil fuel industry saw this climate chaos coming, then literally and figuratively added fuel to the fire, doubling down on a business model incompatible with the science of stopping global warming; buying political inaction; and building a global climate denial and delay machine that has confused the public and fomented distrust of science, media and government.

In October last year, the US Congress began to investigate this history. Before a packed audience at a congressional subcommittee hearing titled Examining the Oil Industry’s Efforts to Suppress the Truth about Climate Change, the Democratic representative Alexandria Ocasio-Cortez questioned the climate scientist Dr Martin Hoffert about his collaborative research with Exxon in the 1980s.

Play Video 1:24 'So they knew': Ocasio-Cortez questions Exxon scientist on climate crisis denial – video

“So in 1982,” she said, referring to a recently uncovered internal company memo containing a graph of global carbon dioxide and temperature levels rising over time, “1982 – seven years before I was even born – Exxon accurately predicted that by this year, 2019, the Earth would hit a carbon dioxide concentration of 415 parts per million and a temperature increase of 1C. Dr Hoffert, is that correct?”

“We were excellent scientists,” answered the former New York University physics professor, triggering laughter from the audience.

“Yes, you were; yes, you were,” the congresswoman agreed. “So they knew.”

This was the first time that Congress – indeed, any legislative body in the world – had heard a firsthand account – from someone who was actually involved in the work – of just how much, and how early, the fossil fuel industry knew of the potential global warming dangers of its products.

The event showed how effective such hearings can be. In the space of a couple of hours, expert witness testimony (including by one of us) and thousands of pages of documented evidence entered the congressional record. Masterful questioning helped translate a key whistleblower’s knowledge into a viral C-Span moment.

It was just one hearing, but it had the makings of the tobacco industry investigations led by Representative Henry Waxman in the 1990s. He could just as easily have been speaking about fossil fuels when he described the purpose of that congressional oversight: “To build a public record and eventually create enough momentum in Congress and among the American public for legislation.”

Our message to Congress after its first foray into investigating fossil fuels is this: keep going. Because big oil is the new big tobacco.

Investigative journalism and peer-reviewed research, including our own, clearly demonstrate that the fossil fuel regime has deliberately denied Americans and Congress their right to be accurately informed about the climate crisis, just as tobacco companies misled Americans about the harms of smoking. From strategy to networks to personnel to rhetoric, the fossil fuel regime’s efforts to deny and delay come straight out of big tobacco’s playbook.

The historical record is incontrovertible. As we summarize in a recent report, the fossil fuel industry’s own internal documents reveal that it has been studying CO 2 pollution for more than 60 years. As early as the 1950s, it knew its products had the potential to change the climate. By the late 1970s and early 80s, Exxon scientists were explicitly aware that burning fossil fuels could lead to what they called “catastrophic” global warming. In 1986, an internal “greenhouse effect working group” at Shell concluded: “The changes in climate … may be the greatest in recorded history.”

For all the skeletons we have already found in big oil’s closet, we are still only looking through the keyhole

But instead of taking action or warning the public, fossil fuel interests stayed quiet. Then, in the late 1980s and early 90s, when global warming finally caught the world’s attention, the carbon majors sprang to action and took the low road, spending billions of dollars over the next 30 years on advertising and lobbying challenging science, slandering scientists and attacking policies to protect their profits. In so doing, they have undermined – and continue to undermine – Americans’ chances of a just and stable future.

Today, the case for subterfuge is so strong that New York, Massachusetts, Rhode Island and 14 US cities and counties have variously sued ExxonMobil and other fossil fuel companies for fraud, damages or denial. Maui and Honolulu have recently added their intentions to file lawsuits. In Australia, there are mounting calls to make polluters, not just taxpayers, pay for wildfire relief and climate mitigation.

For all the skeletons we have already found in big oil’s closet, however, we are still only looking through the keyhole. Tracking down a few hundred documents has allowed us to uncover some key cogs in the climate denial machine. Yet it is a sprawling, well-funded, well-oiled network that stretches far beyond ExxonMobil and the Kochs: a labyrinth of people and money connecting fossil fuel companies, utilities, ancillary manufacturers, trade associations, PR firms, advertising agencies, libertarian foundations, thinktanks, legal firms and individuals, all feeding an echo chamber of pundits, astroturf groups, blogs, media and, yes, politicians. Network analysis has identified at least 4,556 individuals and 164 organizations in the global web of denial. We believe the American public deserve to know the truth – and see the receipts – of these dealings that have already led to deaths, destruction and the injustices of a collapsing climate.

Climate emergency: 2019 was second hottest year on record Read more

This is where congressional authority to request documents and, if necessary, issue subpoenas, comes in. Key breakthroughs in tobacco control came as congressional investigations – as well as legal discovery and industry whistleblowers – exposed thousands, and ultimately millions, of damning documents. The tobacco industry was found guilty of racketeering in part because of the ways that individual companies had coordinated with each other and with third-party allies to present false information to consumers. That history is a precedent for Congress to investigate an industry network that has misled the public and policymakers in an effort to deny the dangers of its products and derail regulation.

As the congressional scholar Morton Rosenberg recently testified in the Senate: “Congress and its committees have virtually plenary power to compel production of information needed to discharge their legislative functions.”

We are not politicians or political strategists, so we do not presume to dictate how Congress exercises its investigatory powers. But as experts in the history of climate denial and global warming politics, it is our opinion that holding the fossil fuel industry accountable would be one of the most impactful ways for Congress – and governments around the world – to combat the climate crisis. Impeachment investigations understandably occupy much attention. Unfortunately, irreversible global warming and the fossil fuel regime underwriting it will be even harder to unseat than a president, and time is not on our side.