In this Saturday photo, NSW Rural Fire Service crew fight the Gospers Mountain Fire as it impacts a property at Bilpin, New South Wales state, Australia. Credit: Dan Himbrechts | AAP Images via AP

“The point of no return is no longer over the horizon,” U.N. Secretary-General Antonio Guterres warned as the 25th climate summit opened in Madrid earlier this month, and the multitude of delegates from more than a hundred countries presumably understood what he meant. But they ignored it anyway.

The “point of no return” arrives in the mid-2030s, when the rising emissions of greenhouse gases (they are still rising, not falling) pushes the amount of carbon dioxide equivalent in the atmosphere up past 450 parts per million. That level of CO2 drives the average global temperature 2 degrees Celsius higher than the pre-industrial average and into runaway territory.

What happens at 450 ppm is that the 2 degrees of warming caused by human beings trigger natural processes (“feedbacks” or “tipping points”) that also cause warming — and once they start, human beings cannot stop them. The Big Three feedbacks are the loss of the Arctic Ocean’s ice cover, the melting of the permafrost zone and the release of vast amounts of CO2 by the warming world oceans.

Guterres called it “the point of no return” because after that we lose control. The warming will then continue even if human beings eventually stop all of their own emissions. We will be trapped on an “up” escalator that delivers us into a world 3, 4, even 5 degrees hotter than the pre-industrial average.

That is exactly where the World Meteorological Organization predicts we will be by the end of this century if current promises on emissions cuts are kept, but no more is done. Long before the end of the century that would mean the collapse of food production in the tropics and the subtropics, famines and huge refugee flows, mass death.

They never spell these things out at the climate summits, but almost everybody there knows them. And yet, once again, they failed to produce a deal that moves the process forward. The best that can be said is that they stopped a concerted attempt by the biggest emitters, led by Brazil and Australia, to gut the proposed rules for a global carbon market.

How can they be so blind to their long-term interest in survival? The answer, alas, is that our evolutionary past of human beings has not made human societies good at long-term thinking. Moreover, human politics is dominated by those whose interests will be advanced or damaged by what the government does right now, not in 15 years’ time. Take Australia, for example.

Australia is the driest continent, and as the heat mounts (much of the country saw temperatures in the low to mid-40s Celsius last week) the number and scale of bushfires has exploded. The biggest blaze, in the Blue Mountains west of Sydney, has already burned more than 400,000 hectares and is still growing.

But Australia is also the world’s biggest exporter of coal, mostly to China and Japan. Coal-mining only employs 38,000 Australians, but it brings in a lot of money, some of which inevitably ends up as political contributions that link the industry with all the Australian political parties.

That’s why, two years ago, Liberal (i.e. conservative) politician Scott Morrison brought a lump of coal into parliament. It was “clean” coal, in the sense that it had been lacquered so that it wouldn’t dirty people’s hands. Morrison passed it around to his parliamentary colleagues saying “Don’t be afraid, don’t be scared, it won’t hurt you. It’s coal.”

ScoMo (as the Australian media have nicknamed Morrison, presumably because it sounds a bit like “scum”), is now prime minister, and as the country burns he continues to deny any link between burning coal and global heating. He offers his “thoughts and prayers” to the victims of the fires, but insists that climate change is only one of “many other factors” in fueling the bushfires.

Of all the major emitters, only the European Union is taking its responsibilities seriously. The rest range from deeply conflicted countries such as China and Canada, both aware that climate change is an existential threat but both hugely dependent on fossil fuels, to the outright deniers such as Australia, Brazil, Saudi Arabia and the United States.

So one by one, we are missing all the exits on the Highway to Hell.

Gwynne Dyer’s new book is “Growing Pains: The Future of Democracy (and Work).”