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Illustration: Annelise Capossela/Axios

Climate change is like a snowball effect, except, well, hot.

Why it matters: Like a snowball begins small and grows larger by building upon itself, numerous feedback loops embedded in our atmosphere and society are exacerbating climate change.

Driving the news: Scientists are well acquainted with feedback loops, but the often wonky topic doesn’t break through into the mainstream despite its importance to how much the world warms and how much we respond to that warming.

  • As we soak up the last of these hot summer days, and extreme weather hits parts of the country, today seems a fitting time to break this down for those of us without a Ph.D.

Here are seven feedback loops in science and beyond.

Air conditioning

How it works: Climate change is making our summers hotter, so we use more air conditioners, which emit greenhouse gases, which heats up our planet more, so we use even more AC, which heats up our planet even more ... You get the cycle.

  • This is an easy-to-understand feedback loop, but it’s not going to have a big impact on our emissions, says Zeke Hausfather, a climate scientist at the research group Breakthrough Institute.
  • The bigger impact is likely to be population growth in developing countries in hot parts of the world, like India, getting AC to survive their ever-hotter weather.
Water evaporation

This one’s more technical but far more consequential for Earth’s temperature than the AC example.

How it works: The atmosphere heats up as we emit heat-trapping greenhouse gases.

  • This warmer air leads to more water evaporation from water and land.
  • This evaporation results in water vapor, which itself is a greenhouse gas and traps heat.
  • The increased amount of water vapor in the atmosphere retains ever more heat, which leads to more water evaporation, which results in more water vapor, which....

Between the lines: This type of feedback loop more than doubles the amount of global warming, says Hausfather.

Permafrost

This is a type of feedback that has only recently begun to be included in climate models, says Philip Duffy, climate scientist and president of the nonprofit Woodwell Climate Research Center.

How it works: It’s like a massive freezer thawing atop the world, Duffy says. Nearly a quarter of Northern hemisphere land has permafrost underneath it.

  • As the world warms, organic matter — plants and dead animals frozen for tens of thousands of years — starts to decompose. “Those decomposition processes emit greenhouse gases,” Duffy said.
  • Scientists estimate that there's twice as much carbon locked up in permafrost as is already in the atmosphere, Duffy says. "The potential to amplify warming is huge.”
Albedo feedback

This is similar to permafrost. It’s why you feel hotter in black clothes compared to white clothes.

How it works: Lighter surfaces reflect heat more, so as ice and other cold places get warmer (i.e., the Arctic and other permafrost), their ability to reflect heat diminishes and they soak up more heat.

  • “As the world warms, expect a lot of ice and snow to melt, which uncovers darker surfaces, which will result in more warming,” said Hausfather.

Between the lines: This phenomenon, combined with the permafrost one, helps explain why the planet's poles warm faster than the rest of the world.

Wildfires

How it works: Trees, by definition, embody carbon. So when wildfires burn them down, carbon dioxide is emitted.

  • As the world warms, temperatures get hotter and places get drier, creating tinderboxes for when wildfires do start.
  • The hotter the world gets, the bigger wildfires will be (in some places like California), the more CO2 emitted into the atmosphere, which heats up the world more, which will exacerbate wildfires more ...
Policy and economic paralysis

Unlike most policy challenges, climate change gets worse the longer we take to address it.

How it works: The longer we wait to address climate change with major government action, the bigger the policy needed and the bigger economic impact that policy will have.

  • But the bigger the policy and economic hit get, the harder the politics get.
  • So we wait longer still, making the required policy and economic impact ever bigger, which makes the politics even more difficult.

Yes, but: Plausible future scenarios also exist where the impacts of a warming world grow so intense and/or clean-energy technologies become so cheap that eventually these aforementioned feedback loops are broken.

Geopolitics

How it works: It takes global cooperation to address climate change, given its global nature. But climate change impacts different countries differently, so they're more likely to act on their own, and in their own self-interest.

  • But if there's no global cooperation, climate change continues to get worse — prolonging the adverse impacts on different countries, and giving them even less incentive to cooperate with other countries and more incentive to act on their own.

The bottom line:

“The possible scenario that is a real nightmare is if we don’t control human emissions, nature takes over and we lose control of the warming, because of these emissions from natural systems.”
— Philip Duffy, climate scientist

Go deeper

Ben Geman, author of Generate
Jan 27, 2021 - Politics & Policy

Biden to sign major climate orders, setting up clash with oil industry

Illustration: Aïda Amer/Axios

President Biden will sign new executive actions today that provide the clearest signs yet of his climate plans — elevating the issue to a national security priority and kicking off an intense battle with the oil industry.

Driving the news: One move will freeze issuance of new oil-and-gas leases on public lands and waters "to the extent possible," per a White House summary.

Updated 8 hours ago - Politics & Policy

Omicron dashboard

Illustration: Brendan Lynch/Axios

  1. Health: Pfizer and Moderna boosters overwhelmingly prevent Omicron hospitalizations, CDC finds — Omicron pushes COVID deaths toward 2,000 per day — The pandemic-proof health care giant.
  2. Vaccines: The case for Operation Warp Speed 2.0 — Starbucks drops worker vaccine or test requirement after SCOTUS ruling — Kids' COVID vaccination rates are particularly low in rural America.
  3. Politics: Biden concedes U.S. should have done more testing — Arizona says it "will not be intimidated" by Biden on anti-mask school policies — Federal judge blocks Biden's vaccine mandate for federal workers.
  4. World: American Airlines flight to London forced to turn around over mask dispute — WHO: COVID health emergency could end this year — Greece imposes vaccine mandate for people 60 and older — Austria approves COVID vaccine mandate for adults.
  5. Variant tracker

Arizona governor sues Biden administration over COVID funds tied to mandates

A teacher prepares a hallway barrier to help students maintain social distancing at John B. Wright Elementary School in Tucson, Arizona, on Aug. 14, 2020. Photo: Cheney Orr/Bloomberg via Getty Images

Arizona Gov. Doug Ducey (R) filed a lawsuit Friday against the Biden administration for ordering the state to stop allocating federal COVID relief funds to schools that don't comply with public health recommendations such as masking, the Arizona Republic reports.

Why it matters: The Treasury Department said last week that the state would have to pay back the money if Ducey does not redesignate the $173 million programs to ensure they don't "undermine efforts to stop the spread of COVID-19."