There are different flavors of doomers. Some are middle-aged and have been influenced by outspoken scientists — like retired ecologist Guy McPherson — who claim that human extinction, or at least the breakdown of society, is imminent. (“I can’t imagine that there will be a human left on the Earth in 10 years,” McPherson has said.) These doomers drift toward conspiracy theories, sometimes claiming that the Intergovernmental Panel on Climate Change is downplaying the seriousness of the issue.

The report, which focused on how an increase of 1.5 degrees Celsius from preindustrial levels might compare to 2 degrees Celsius, included grim predictions like the death of the world’s coral reefs and ice-free summers in the Arctic. But a central message many took from the report — that there were only 12 years left to save the planet — wasn’t even in the report. It came from a Guardian headline.

In three of the four pathways the report charted for limiting warming to 1.5C, the world would have to cut carbon dioxide emissions 40 to 60 percent by 2030. “We have 12 years to limit climate catastrophe,” the Guardian reported, and other outlets soon followed. The phrase soon became an activist rallying cry.

“‘Twelve years to save the planet’ was actually: We have 12 years to cut global emissions in half to stay consistent with a 1.5C scenario,” Hausfather explained. “Then ‘12 years to save the planet’ becomes interpreted by the public as: If we don’t stop climate change in 12 years, something catastrophic happens.”

Hausfather said part of the problem is that climate targets — say, the goal to limit warming to 1.5C — have become interpreted by the public as climate thresholds, which would drive the planet into a “hothouse” state. In fact, scientists don’t believe there is anything unique about that temperature that will cause runaway tipping points; the landmark IPCC report merely aimed to show the risks of bad impacts are much higher at 2C than at 1.5.

The problem with climate “doom” — beyond the toll that it can create on mental health — is that it can cause paralysis. Psychologists have long believed that some amount of hope, combined with a belief that personal actions can make a difference, can keep people engaged on climate change. But, according to a study by researchers at Yale and Colorado State universities, “many Americans who accept that global warming is happening cannot express specific reasons to be hopeful.”

And it’s not just Americans. Andrew Smith, a retired engineer from Yorkshire, England, is slightly turned off by the term “doomer.” It provokes, he says, a sense of being on the fringes of society, or visions of doomsday preppers filling their bunkers with canned food. “For me, a climate doomer is simply a person who’s taken a look at the peer-reviewed science, taken stock of the natural world around them, and come to a conclusion,” he wrote in a message via Twitter. Smith believes that the world is on track to warm 4 to 8 degrees Celsius compared to preindustrial times.

For some, however, doomism isn’t permanent. Youra, the former engineer, still remembers how strongly he felt that humanity was done for. He believed that the IPCC and other scientists were covering up how bad climate change actually was — and no peer-reviewed research could convince him otherwise. “I think it’s kind of similar to what deniers feel,” he said. “I wasn’t being open-minded.”

In 2018, he briefly considered quitting his job to travel the world — hoping to see what he could before society and the natural world collapsed. Slowly, though, he started getting involved in local climate groups, and when he attended a meeting in Alameda for the California city’s climate plan, something clicked. “I think that for me was key,” he said. “It made me start realizing the power of good policy.” Now 32, he has earned a master’s degree in environmental science and policy and works as the climate action coordinator for the California towns of San Anselmo and Fairfax.

Worry — and even occasional despair — about the climate crisis is normal. Most scientists believe that, without deeper cuts, the world is headed for 2 to 3 degrees Celsius of global warming. But higher temperatures are still possible if humans get unlucky with how the planet responds to higher CO2 levels. Kate Marvel, a climate scientist at the NASA Goddard Institute, has said that while humans probably won’t go extinct due to climate change, “not going extinct” is a low bar.

For his part, Youra has advice for those who are suffering from the same sort of fatalism that he once felt. “Stop engaging excessively with negative climate change content online and start engaging in your community,” he said. “You can be one of those voices showing there is support for the solutions.”