The day after us

Earth without humans: 11 things that happen when we’re gone

Image: Peter Herrmann

What if every human vanished right now? For the sake of this thought experiment, let’s assume that there was no big war, no virus—just poof, gone. Nature wouldn’t hesitate to reclaim what we built. From silent cities to nuclear disasters, the world would start changing immediately. Here’s what would actually happen, and how fast, if people disappeared from Earth.

Image: Andriy Nestruiev

Power plants need constant maintenance. Without humans, fossil fuel stations would shut down within just a few hours. Backup generators at nuclear and hydro plants might last a couple more days, but without human oversight, even they’d fail.

Eventually, power grids would collapse worldwide, and complete darkness would fall on cities within a day or two.

Image: Nenad Spasojevic

Pumps in underground transit systems like NYC’s run nonstop to keep out water. Without maintenance (and more importantly, power), those pumps would stop working in just a couple of days.

By the end of the first week, tunnels would begin flooding, damaging infrastructure, and washing out entire underground networks.

Image: Praswin Prakashan

Most domestic animals rely entirely on humans for food, water, and shelter. Dogs might form feral packs, but millions—especially indoor pets—would eventually die of starvation.

Livestock like cows and chickens would perish or become easy prey, disrupting rural food chains. However, within a few generations, some could revert to free-roaming behavior, similar to their wild ancestors.

Image: Lukáš Lehotský

Without humans, nuclear power plants would quickly become major hazards to all surviving life. Most reactors would automatically enter into safe mode and shut down within hours, as automated systems detect the loss of the electrical grid.

However, cooling systems require active maintenance. Within a short time, without intervention, reactor cores would begin to overheat. Multiple Fukushima-style meltdowns could occur, releasing radioactive material into the air, soil, and water across entire regions.

Image: Juan Manuel Núñez Méndez

Salt, moisture, and wind would destroy most human-made bridges within decades. Without protective coatings, steel corrodes and load-bearing cables weaken over time.

Even iconic structures like the Golden Gate Bridge would likely collapse within 100 years. In contrast, ancient Roman structures and other archaeological remains that have already endured for millennia could survive for many centuries more, barring major seismic events or other natural disasters.

Image: Erik Mclean

Many animal populations would thrive without humans suppressing them. Species once hunted or crowded out would reclaim territory.

Wolves, bears, deer, and even predators like big cats could return to their former ranges, reshaping ecosystems quickly.

Image: Miikka Luotio

Plants would break through pavement and reclaim roadways within a few years—something nature wastes no time doing, as we can see in any abandoned roads or areas today.

Tree roots and erosion would be the first to crack and crumble concrete and asphalt. And without vehicles to maintain wear patterns, roads would soon disappear under grasses, shrubs, and eventually forest.

Image: Tejj

Like many human-made structures, dams require active monitoring to prevent erosion, cracking, and overflow. Within a few decades, silt buildup and unchecked water flow would cause many to breach or collapse.

The resulting floods would be catastrophic, reshaping river valleys and floodplains across entire continents.

Image: Nik

What would happen to our cultural legacy? Without us, it won’t last long. Books, paintings, and digital media would begin to degrade quickly.

Even in semi-protected conditions, paper would yellow and crumble. Museums without climate control would suffer from mold and temperature damage. Hard drives and servers would corrode and become unreadable within decades.

Image: Cédric Dhaenens

Despite the chaos our disappearance would bring to most ecosystems, there’s a silver lining: greenhouse gases would decline over time, gradually cooling the planet. Oceans and plants would absorb the excess CO₂.

Within a few hundred years, global temperatures could return to pre-industrial levels, though damage like ice sheet loss would take millennia to undo.

Image: jean wimmerlin

Most recognizable evidence of human civilization would vanish over a few thousand years. Materials like plastic, glass, and some metals might persist for over 500,000 years, but nature would slowly break them down.

Concrete crumbles, buildings collapse, and corrosion eats metal. After 10,000 years, only massive stone structures like Mount Rushmore or the Pyramids might remain—weathered and barely recognizable. Even our radio signals would eventually fade into cosmic background noise.

Hospital secrets

What is a "Code Gray" and what you should know if you hear it at the E.R.

A trip to the emergency room can be stressful enough without hearing doctors and nurses speak a language that sounds like a secret code. One minute, someone is asking for medication "STAT," the next there’s a "Code Gray," and another patient is suddenly "NPO." What do those words really mean? Some are official medical terms, others are insider slang, but they all help hospital staff communicate quickly when every second counts. Here are 10 of those codes explained.

The E.R. can be hectic and unpredictable. Most patients are frightened or uncomfortable, but now and then someone becomes aggressive because of pain, confusion, mental illness, or the effects of alcohol or other substances. That’s when you can hear "Code Gray" announced over the speakers.

The code is used to summon security officers to help manage a violent or combative situation. While color codes vary from one hospital to another, Code Gray commonly signals that staff needs extra assistance to protect patients, visitors, and healthcare workers. Even if you know it now, most people in the waiting room never know what happened, and that’s exactly the point.

You have a scheduled surgery, you’re in your bed waiting to be taken to the surgery room, and you ask for a cup of coffee to make the wait lighter. The nurse will probably tell you you’re an NPO. You may think it’s serious, but it’s simply a procedure.

"NPO" is an abbreviation that comes from the Latin phrase Nil Per Os, which means "nothing by mouth." It tells patients they cannot eat, drink, or sometimes even take medication until doctors say it’s safe. The rule is most common before surgery or certain medical tests, when food or liquids could increase the risk of complications or alter the results. It may be frustrating, but it’s an important part of keeping patients safe.

You’ve probably been through the experience of visiting an emergency room, either to get checked or to visit a loved one. In that part of the hospital where everyone is rushing to save lives, you’ve probably heard a doctor asking for the R.C.P. cart or medication "STAT!" It sounds urgent, and that's because it is.

The expression comes from the Latin statim, which means "immediately" or "without delay." Hospitals have used Latin medical terms for centuries, but STAT is one of the few that remains part of everyday conversation. When a doctor says it, the request jumps to the top of the priority list. It doesn’t always refer to a life-or-death situation, but it does mean the medical team needs something done as quickly as possible.

Newborns are always a reason to celebrate at the hospital. Parents usually rest happily next to their child as they receive congratulations from close relatives. However, the hospital is always prepared to handle extremely rare emergencies under "code pink."

If you hear a "Code Pink," it usually means a baby or young child is suspected of being abducted from the hospital. Within seconds, security officers respond, exits may be monitored or blocked, and staff begins following carefully rehearsed procedures. Although different hospitals sometimes use different color codes, Code Pink has become widely recognized across North America as one of the most serious alerts a hospital can issue.

If you’ve ever spent a few days in the hospital, you’ve probably noticed that some patients are walking up and down the halls, while others need help just getting out of bed. When a nurse refers to someone as a "walkie-talkie," it’s actually good news.

This informal expression refers to patients who can walk on their own, use the bathroom without assistance, and handle most basic tasks independently. It’s not an official medical term, of course, but it’s commonly used among healthcare workers because it quickly tells the next shift that the patient requires less hands-on care than many others.

As nurses change shifts, you’ll often hear them give a quick report about each patient. One person may only need medication, while another is described as a "total."

The term is short for a patient who requires total care. They may need help eating, bathing, getting dressed, turning in bed, or moving from one place to another. Although the expression sounds impersonal, it’s simply a practical way for caregivers to communicate how much assistance someone needs.

Most people hear "frequent flyer" and think of an airline reward program. And that’s correct, but in an emergency room, the phrase has a very different meaning.

A frequent flyer is an informal nickname for patients who repeatedly return to the hospital, often due to chronic illness, recurring medical conditions, or other ongoing health issues. Behind the light-hearted nickname is often a difficult reality. Many of these patients are simply dealing with medical problems that require regular emergency care, and the expression is just a way to make the experience a bit lighter among the familiar faces of doctors and nurses.

Not all codes are for patients. The next time you’re in a hospital, look closely at what the nurse is pushing from room to room. It may look like a small rolling desk with a computer on top. Staff often call it a "WOW," short for "workstation on wheels."

As hospitals switched from paper charts to electronic medical records, these mobile computers became essential. Nurses use them to review test results, scan medications, update patient charts, and check doctors’ orders without leaving the bedside. The name sounds funny, but the technology helps caregivers spend more time with patients instead of walking back and forth to a nursing station.

After getting a shot or having blood drawn, most patients never think about where the used needle ends up. It certainly doesn't go into an ordinary trash can.

Hospitals place needles, scalpels, and other sharp medical instruments into special containers designed to prevent accidental injuries. These sturdy, puncture-resistant boxes are sealed when full and safely disposed of in accordance with strict health regulations. This not only protects nurses, but it also protects cleaning crews, waste handlers, and even the public from dangerous needle sticks. It’s one of the most important safety measures in every hospital, even though most patients never notice it.

If you’ve ever watched a medical drama, you've probably seen a patient become so agitated that several staff members rush into the room. In situations like that, a doctor or nurse may ask for a "B-52." But the name has nothing to do with numbers themselves; it actually comes from a medicine.

B-52 is hospital slang for a fast-acting injection used to calm down patients who are severely combative or at risk of harming themselves or others. The nickname comes from a commonly used combination of medications that usually include diphenhydramine, haloperidol, and lorazepam. It’s strictly reserved for when other methods of calming the patient haven’t worked.