Chapter 382

Zhang Yuan carefully observed the so-called tree core. There were some hollow screen tubes in the middle, and the overall density was much lower than that of steel.

Yamamoto said surprisingly, "these tree hearts are very good materials for Riley civilization, providing shelter and food... But they are also a great crisis to destroy the whole ecological chain!"

He hung a bit of wood debris with a knife and lit it with a lighter.

Suddenly, the whole burning phenomenon produced a faint smoke.

Zhang Yuan covered his nose and smelled the burning smell of plastic. He was thoughtful.

Everyone smelled the smell.

"It's really like plastic."

"What is plastic?"

Zhang Yuan explained: "it's a kind of polymer material from oil. It's very cheap. It was widely used by earth civilization. However, after the oil is exhausted, it's useless and can only be converted to a large number of renewable materials."

Yamamoto pressed the button again. "Do you smell it? This kind of tree core is a natural polymer material, and its chemical composition is a little similar to the plastics widely used on our earth, that is, very stable chemicals. "

An image is displayed on the screen. Human geographers have found a fossil vein in a plain area: a large organic mine with a reserve of 300 million tons!

"Almost all the components of this organic mineral are the heart of the world tree. Because it has been buried underground for a long time, it has become something similar to coal. Even better than coal and higher calorific value. "

Some quick thinking biologists have reacted. Why does Professor Ichiro Yamamoto think there is a mass extinction on this planet!

Why?

"Because these tree hearts... Can't be decomposed by local microorganisms! That's why they pile up. "

Zhang Yuan was surprised and a little speechless. Human beings could actually witness... A mass extinction!

The so-called "World Tree" of the Riley people is undoubtedly a very excellent species on this planet, providing food and living places for the Riley people.

Because of its strong ability to adapt to the environment, the trace of "World Tree" is almost everywhere on the planet.

But also because of the "tree heart" of the world tree, evolution is too advanced, so that local microorganisms can not decompose this highly stable material at all.

A large number of organic mineral veins found by human beings on the plain are formed only when the other fibers in the original forest decay and accumulate in the tree core and precipitate underground.

Why do we say that this will lead to mass extinction?

The simple truth is that the carbon cycle of the native planet has been destroyed.

In the normal situation of aerobic breathing, consumers inhale oxygen and exhale carbon dioxide, while producers inhale carbon dioxide and produce oxygen to form a carbon cycle.

But now, a large number of carbon elements have become the heart of the tree and sink underground, which will gradually reduce the concentration of carbon dioxide in the atmosphere. Plants do not have enough carbon dioxide and die in large quantities, and then animals die in large quantities.

The carbon dioxide concentration of the planet is about 5 / 1000, millions of years, and tens of millions of years. After that, the carbon dioxide may be reduced by 60% - 80%. At this time, it is difficult for plants to reproduce, which will produce real lethality.

A biologist sitting below asked, "is there anything that native microorganisms can't decompose? Professor Yamamoto, are you sure your scientific research is correct? "

This problem was explained by an expert in charge of Geographical Science: "we have found the effective components of the tree core in the soil all over the world... Although these substances are high molecular organic substances, which will become some small debris due to physical effects, even these debris decompose very slowly and can exist stably for thousands or even tens of thousands of years. It shows that the decomposers of this planet can not effectively decompose the tree heart of the world tree. "

"How to say, it's like plastic. Although small plastic particles are not poisonous, they will not be decomposed when buried underground for a long time. The active ingredients of tree heart are even more stable than plastic and can exist for a longer time. "

Zhang Yuan nodded.

This is the origin of the great crisis.

The expert continued, "ladies and gentlemen. This kind of environmental mutation caused by plant evolution has not never happened on earth... "

"2.4 billion years ago, there was a 'big oxygen event' on the earth. The big oxidation event changed the composition of minerals on the earth and made the emergence of animals possible in the future."

"That is, the oxygen content of the whole planet has soared, which is mainly due to the rapid evolution of plants, the formation of wood fibers, and the fungi that decompose plant fibers have not yet appeared. This has led to a sharp reduction in the concentration of carbon dioxide in the air. "

"A large number of carbon elements were solidified and deposited underground with the life cycle of plants, so that high-quality coal was formed in the Carboniferous, benefiting later born humans."

"At the beginning, the decomposing ability of the earth was not strong enough, the proportion of carbon dioxide in the atmosphere decreased, and the proportion of oxygen increased significantly. In the Late Carboniferous, the proportion of oxygen in the atmosphere reached the highest stage in the history of the earth. The sudden change of the environment led to the great extinction of organisms, followed by the great biological explosion. "

All of you here understand the rhetoric in this regard.

"Laili star is also in such a special stage. With the accumulation of time, more and more dead world trees and more accumulated tree hearts."

"The planet has been formed for a long time. The concentration of carbon dioxide in the atmosphere is not too high. Where does carbon come from? After the carbon dioxide in the atmosphere is consumed, of course, it is the carbon element in organisms... Animals have birth, old age and death. As long as there are more dead organisms than born, with the destruction of the carbon cycle in the whole world, more and more carbon elements will be buried underground! "

"Without carbon dioxide in the atmosphere, there will be fewer and fewer plants and fewer animals. The concentration of oxygen will rise instead.

"The great extinction, that's it, it's beginning!"

"Or the mass extinction has begun, but these Riley people don't know it. Thousands of years later, animals and plants are scarce, and a large amount of carbon has become a plastic like substance... In theory, that's it. "

Everyone sat quietly in their seats, thinking, thinking.

After the extinction of this creature was exposed naked, it was serious and full of heavy killing intention.

From the killing intention of the planet itself.

This killing has always been slow and firm.

Even, as human beings of interstellar civilization, it is difficult to stop this power from the planet itself.

……

(PS: without the comments of stupid loser online games, I feel that it's not passionate to write!

Especially in the past few days, it was still pushed by the strong wind, which was covered by the big red flag, resulting in the unsatisfactory increase of collection... Ah, it's bad luck, but I'd better celebrate at the third watch!)

(the National Day military parade is still quite spectacular, and my speech will not be published. I like the df41 nuclear bomb best. Although it can't be used in war, it means real security!)