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The Earth has survived some serious catastrophes. Here are the 4 worst.

Our planet's had a bit of a rough past. But the Earth is nothing if not a survivor.

Here are the four worst things the Earth has survived so far:

1. The Big Splash, aka that time the universe punched Earth in the face and may have created the moon

Imagine a young Earth. Like, super young. Only 20 million years after the solar system even formed. A little precious baby Earth.


And then imagine the universe smashing it in the face with an object the size of Mars.

Image from NASA/JPL-Caltech/Wikimedia Commons.

That's the giant impact hypothesis, also known as The Big Splash. Scientists who back this hypothesis think that about 4.5 billion years ago, just after the Earth formed, another proto-planet called Theia may have slammed into it, ejecting rocks and magma out into space. Ouch.

It's not all bad, though. Some of that rock and magma may have coalesced out there in space and eventually turned in our moon. If this is true, it helps explain some of the weird things about our moon, like why Earth rocks and Moon rocks look so similar.

2. The Oxygen Catastrophe, aka that time Earth's entire atmosphere turned into poison and then turned the sky blue

After surviving The Big Splash, Earth had a nice little period of time where it got to relax and, you know, enjoy being covered in magma and stuff.

So relaxing. Image from ESO/L. Calçada/Wikimedia Commons.

Eventually, however, a combination of gas emerging from inside the Earth and meteors crashing into Earth created oceans and an atmosphere around the planet. There were even some wiggly little bacteria-like things swimming around Earth's prehistoric oceans too.

But those oceans, skies, and wiggly things would have looked totally alien to us. That's because there was pretty much no oxygen in Earth's atmosphere (which would have made the sky orange and the ocean blood-red). That was just fine for primitive life-forms, though, because if you're a little anaerobic microbe, oxygen is super poisonous.


Before oxygen, most of the Earth's atmosphere would have been methane, which would have made its surface look a lot like Saturn's moon Titan. Image from ESA/NASA/JPL/University of Arizona/Wikimedia Commons.

Then, about 2.3 billion years ago, some little upstart cyanobacteria discovered photosynthesis and decided to start pooping out oxygen. After all, for them, oxygen is just waste, right?

For about 200 million years, cyanobacteria did just that. Most life on Earth kind of ignored it until suddenly oxygen was everywhere and nearly everything died. (Way to go, cyanobacteria.)


Cyanobacteria, the ultimate party poopers. Image from Doc. RNDr. Josef Reischig, CSc./Wikimedia Common.

In fact, there was so much oxygen, it broke down the methane in the atmosphere and rusted the iron right out of the oceans, which turned the ocean and sky blue.

That wasn't so bad: Earth got some nice little green life-forms, and the ocean no longer looked like something out of "The Prince of Egypt." All was well. Right?

Hahaha, no. It gets worse.

3. Snowball Earth, aka that time Earth was more frozen than a Disney movie

It turns out the Earth was totally using the methane in the atmosphere to keep the planet from from freezing — so when the cyanobacteria from The Oxygen Catastrophe broke down the methane in the atmosphere, there was nothing more to say than ... welcome to Snowball Earth.


Image from Stephen Hudson/Wikimedia Commons.

Scientists aren't sure whether this was a complete freeze or if there was a thin band of non-frozen water around the equator, but that's little consolation to the vast majority of the Earth, which was under ice sheets that could have been miles thick.

This probably hasn't happen just once, either. This kind of Earth-over deep freeze has happened again and again and again. The last bout of global freezing may have taken place about 650 million years ago.

But hey! Eventually Earth broke out of its little winter wonderland (possibly thanks to volcanoes), and life suddenly began flourishing like crazy!

Look at these trilobites! Image from Heinrich Harder/Wikimedia Commons.

In fact, for a while, things were going pretty well. Earth was starting to look like, you know, the Earth we know today. Too bad there was at least one more giant setback waiting in the wings.

4. The Great Dying, aka that time everything on Earth almost died

With The Big Splash, The Oxygen Catastrophe, and Snowball Earth solidly in the planet's rearview mirror, and a bunch of plants and animals running around on land, things were looking pretty good.

Then, about 250 million years ago, The Permian Extinction, a disaster so horrible scientists sometimes call it The Great Dying, happened. It more than earned its name, too. 96% of marine species went extinct as did 70% of land vertebrates.

What caused it? Scientists still aren't sure. Some think it might have been a collision with an immense asteroid or runaway methane or maybe what we now know as Russia simply ... exploding.

Either way, we know it took millions of years for life on Earth to recover. A lot of the more popular lineages of animals, like trilobites and a lot of mammal-like reptiles, were wiped out, leaving huge vacuums in the ecosystem. A few lineages did survive, however, including the ancestors of modern mammals and dinosaurs. Dinosaurs!

OH HEY, DID SOMEONE SAY DINOSAURS? Image from Dominik Reinold/Pixabay.

Thanks to climate change, today the Earth is going through some transformations too. With the planet's history as proof, chances are the Earth will survive climate change, too. Whether that includes humans, however...

Look, here's the thing. I like the skies the color they are now, thank you very much. I don't want to live through seas of lava, mile-thick glaciers over Acapulco, or the skies changing color (unless you're talking about a beautiful sunset or the northern lights, of course).

Fighting climate change isn't really about saving the planet. It's about saving ourselves and the other creatures that call Earth home. No matter how cool an ice planet with red skies sounds.

Planet

Easy (and free!) ways to save the ocean

The ocean is the heart of our planet. It needs our help to be healthy.

Ocean Wise

Volunteers at a local shoreline cleanup

True

The ocean covers over 71% of the Earth’s surface and serves as our planet’s heart. Ocean currents circulate vital heat, moisture, and nutrients around the globe to influence and regulate our climate, similar to the human circulatory system. Cool, right?

Our ocean systems provide us with everything from fresh oxygen to fresh food. We need it to survive and thrive—and when the ocean struggles to function healthfully, the whole world is affected.

Pollution, overfishing, and climate change are the three biggest challenges preventing the ocean from doing its job, and it needs our help now more than ever. Humans created the problem; now humans are responsible for solving it.

#BeOceanWise is a global rallying cry to do what you can for the ocean, because we need the ocean and the ocean needs us. If you’re wondering how—or if—you can make a difference, the answer is a resounding YES. There are a myriad of ways you can help, even if you don’t live near a body of water. For example, you can focus on reducing the amount of plastic you purchase for yourself or your family.

Another easy way to help clean up our oceans is to be aware of what’s known as the “dirty dozen.” Every year, scientists release an updated list of the most-found litter scattered along shorelines. The biggest culprit? Single-use beverage and food items such as foam cups, straws, bottle caps, and cigarette butts. If you can’t cut single-use plastic out of your life completely, we understand. Just make sure to correctly recycle plastic when you are finished using it. A staggering 3 million tons of plastic ends up in our oceans annually. Imagine the difference we could make if everyone recycled!

The 2022 "Dirty Dozen" ListOcean Wise

If you live near a shoreline, help clean it up! Organize or join an effort to take action and make a positive impact in your community alongside your friends, family, or colleagues. You can also tag @oceanwise on social if you spot a beach that needs some love. The location will be added to Ocean Wise’s system so you can submit data on the litter found during future Shoreline Cleanups. This data helps Ocean Wise work with businesses and governments to stop plastic pollution at its source. In Canada, Ocean Wise data helped inform a federal ban on unnecessary single-use plastics. Small but important actions like these greatly help reduce the litter that ends up in our ocean.

Ocean Wise, a conservation organization on a mission to restore and protect our oceans, is focused on empowering and educating everyone from individuals to governments on how to protect our waters. They are making conservation happen through five big initiatives: monitoring and protecting whales, fighting climate change and restoring biodiversity, innovating for a plastic-free ocean, protecting and restoring fish stocks, and finally, educating and empowering youth. The non-profit believes that in order to rebuild a resilient and vibrant ocean within the next ten years, everyone needs to take action.

Become an Ocean Wise ally and share your knowledge with others. The more people who know how badly the ocean needs our help, the better! Now is a great time to commit to being a part of something bigger and get our oceans healthy again.

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