"Roar~~!"

A low roar echoed through the primeval forest 290 million years ago, and after a long while, the black sword tiger's symptoms of oxygen intoxication finally eased.

However, it was slumped on the ground, still listless, and its combat effectiveness was close to zero, and it seemed that any earth dog could knock it over.

"Rest, just get some sleep. Seeing that the Black Sword Tiger's breathing was stabilizing and that there was no big problem, Li Kai was relieved, and after calming down, he began to busy with other things.

Taking advantage of the fact that there was still some time before it got dark, the roof of the shelter that Li Kai had built was a little more perfect, barely able to cover the Black Sword Tiger.

During the Carboniferous period, the earth received a lot of rainfall and often rained, so it was full of swamps and lakes everywhere, and the land was surrounded by vast oceans.

However, at the end of the Carboniferous period, the earth's environment changed drastically, the oxygen content of the air decreased, the earth became arid and harsh, giant insects went extinct, and amphibians were also hit hard.

On the contrary, reptiles began to diversify and gradually became the overlord of the earth, beginning the 240 million-year-long reptile era.

"Hey, there are only twelve days, can I really find out the truth about the extinction of Carboniferous creatures?" Thinking of this, Li Kai couldn't help but think of his main task, and had a little headache, because he had no clue about this problem, and his heart was completely bottomless.

How did Carboniferous organisms become extinct?

According to the scientific community, the Carboniferous extinction was caused by the Earth's extremely high oxygen content, which is flammable and can easily cause fires, and the formation of a large number of plants formed a coal layer up to 30 meters thick, which ignited during lightning or mantle magma activity, thus triggering a global catastrophe.

The scientific community has recreated the situation at that time: about 300 million years ago, a ray of fire appeared on the ground, followed by more and more flames, they burned down the trees, and soon formed a sea of fire.

The extremely high oxygen content in the air accelerated the spread of the fire, which spread far away in a matter of days, the animals in the jungle had nowhere to escape, most of them were burned to death, insects such as the giant dragonfly could fly, but their eggs could not, and the insects lost their habitat and eventually became exhausted and fell into the fire.

Ten years later, the fire continues to burn, covering nearly half of the landmass, countless creatures have been burned to death, although there are mountains and rivers to prevent the fire from continuing to spread, but the harmful gases produced by coal burning have gradually spread to the world, these gases have caused the global greenhouse effect, the average temperature has risen by 5 degrees Celsius in ten years, and the eggs of marine animals cannot hatch, so that countless animals are going to die.

Thirty years later, the combustibles burned out and the fire was finally extinguished, leaving a thick layer of ash behind the burned area.

At this time, the Earth's atmosphere is full of harmful gases that continue to cause global temperatures to continue to rise, and after a hundred years, the global temperature may average 30 degrees Celsius (the global average temperature in 1997 was 16.9°C).

A thousand years later, toxic gases continue to evaporate, blocking sunlight and preventing plants from photosynthesizing, causing a large number of plants to die.

After 10,000 years, the toxic gases finally stopped volatilizing, but the world's flora and fauna were devastated, more than half of the land had almost no signs of life, and the earth began to enter a period of recovery.

The above is the scientific research community's view on the extinction of Carboniferous organisms, and the restoration scene summarized from the research findings and the analysis of rock formations, there is a certain basis, but Li Kaisi thinks about it, or feels that there is a certain unreasonableness, after all, the Carboniferous period began about 350 million years ago, ended 290 million years ago, and lasted for 65 million years？

This made Li Kai puzzled.

And since the system has given this task, it means that there must be other triggers for the extinction event.

"Keep it simple, let me get the job done. Li Kai thought to himself, he didn't want to know what the punishment for failing the mission would be.

When night fell, Li Kai lit a bonfire, and in order to prevent the flames from spreading, he also used stones to build a circle around the fire.

The peculiarities of this period forced him to be careful.

Creak~!

From time to time, there is a strange hissing sound from the depths of the dark jungle, which is the sound of primitive giant insects such as Orthoptera and Hemiptera rubbing against their sounders, and if you listen closely, you can hear the sound of chewing that makes your scalp tingle.

And Li Kai realized at this time that he seemed to have made a common-sense mistake and forgot about the phototaxis of insects.

While the light of the fire dispelled the darkness, the mayflies near the swamp were also attracted, they were the oldest and primitive winged insects, and their soft body walls were almost transparent in the light of the fire.

They flew around the flames and were nearly ten centimeters long, many times larger than the current generation, which was less than 30 millimeters long.

"Whew, don't be nervous, mayflies won't attack me, because the adults of mayflies don't eat, and their lifespan is extremely short, they can only survive for a few hours, at most 7 days, so the ancients had the saying that they would die in the twilight of life. ”

Li Kai said to the camera, waving a branch to disperse these giant mayflies.

However, there are many swamps around, and there are countless aquatic mayflies, and there are more and more giant mayflies attracted by the firelight, and Li Kai has no other way but to extinguish the fire.

"Hold the grass, it's so scary!"

"It's really scared to death"

"The anchor is big, I'm really convinced this time, the Carboniferous is too terrifying, the insects are simply big and can eat people"

"It's hard to imagine how many giant insects are hiding in the forest"

"You say, could there be a giant insect in the Carboniferous period that is bigger than the ancient centipede insects?"

"I think it's very likely that there are so few Carboniferous giant insects found today that there must be a lot of undiscovered ones."

"Hahaha, don't scare Xiaokai, look at the anchor's face is scared white"

Looking at the giant mayfly that had dispersed because of the loss of fire, and listening to the sound coming from the darkness, the audience was also frightened after making up for it on their own.

However, there are still bold guys with big brains, pondering more terrifying things, and discussing them in the live broadcast room, which makes Li Kai grit his teeth with hatred, and just wants to bring them to the Carboniferous Period, so that they can also feel it.

......

After a while of idle talking, Li Kai went off the air, ending the first day of live broadcast in the Carboniferous Period, he couldn't find food today, and he needed to minimize his energy consumption.

Well, in fact, to put it bluntly, it is to talk less and go to bed quickly.

So in the hiss of the giant insects, Li Kai covered his coat and fell asleep on the black sword tiger, only the shock protector still flickered faintly in the lonely night.

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