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One thing distinguishing the US Congress that just passed landmark climate legislation: 7% fewer “climate deniers” than the previous session, and 23% fewer than the Congress convened less than six years ago, according to a running tally.

That may have helped pave the way for the country’s first major climate law since the initial Congressional hearing was held on the topic four decades ago. If denying there’s a problem is no longer an option, and the argument you’re left with is this isn't the right time to act, that may not exactly resonate when people are enduring unprecedented heatwaves, wildfires, and deadly floods linked to climate change.

This shift in approach in the US mirrors trends elsewhere.

An analysis of “right-leaning” UK newspaper editorials found that the percentage naysaying climate action dwindled during the past decade, as the number advocating for more action swelled. In the EU, climate change only ranked third among the most serious perceived problems in a 2009 poll, but advanced to first last year. And voters in every federal seat in Australia now support increased action on climate change, according to survey results published last year.

Climate change denialism may not be an official casualty of climate crisis just yet. But its demise is being hastened by a growing awareness of the cost of complacency.

A few years after a Swedish scientist suggested in 1896 that increasing atmospheric carbon dioxide will raise Earth’s surface temperature, his theory was knocked down by a peer and went dormant for decades.

A brief newswire item in 1969 noted that scientists had “warned the human race” about pollution’s impact on the climate. That year, an adviser to US President Richard Nixon argued in a memo that the “carbon dioxide problem” might be one that can seize the imagination of voters “normally indifferent to projects of apocalyptic change.” He suggested the administration get involved.

As people began to realize the scientists alarmed by global warming might know what they’re talking about, denialism gained momentum and generous financial backing.

The benign-sounding Global Climate Coalition appeared in 1989. A few years later the US lobbying group issued a press release emphasizing that some scientists think “the world’s climate is naturally, gradually cooling.” In the lead-up to negotiations for a global climate agreement in Kyoto in 1997, the group placed an advertisement calling it a “bad deal for America.” The US opted out.

Abundant denialism carried into the next century. A form of news reporting that both-sidesed the “debate” by portraying denialists as independent thinkers, despite evidence to the contrary, didn’t help.

More recently, climate change denialism has been undercut by arresting images of the driest spot in North America turning into one of its wettest, or of people wearing shorts in a rapidly-warming Arctic.

It’s also been diminished as farmers are forced to go without irrigation, and shipping firms suddenly lack functional waterways. The climate change-linked drought now undermining trade in Europe comes as the region’s already faced with a looming recession.

Yet, denialism persists. Research published earlier this year found that Facebook was failing to label about half of the climate change denial on the site, even after pledging to crack down.

It’s also evolved; a scientist who once got death threats from climate deniers described a shift in their tactics, from vehement rejection to deflecting blame and delaying action.

Ultimately, hard economic realities should make this less tenable – and further vindicate the people who’ve spent decades trying to cut through cynicism and deceit to sound the climate alarm.

In 1988, a handful of US Senators sent a letter about global warming to the incoming Secretary of State, proposing the country “take a lead role on this global problem.” That would not always be the case over the years. But one of those senators is now the President. It was his job to sign the long overdue climate legislation passed by Congress, and promising a historic reduction in emissions.

For more context, here are links to further reading from the World Economic Forum's Strategic Intelligence platform:

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