Primary 2 Chinese homework If there were no trees, what disasters would it bring to mankind ?

1. Lack of absorption of solar heat by plants, the earth's temperature rises greatly, resulting in the melting of glaciers, the north and south poles, and the rise of sea levels.

2. The lack of vegetation protection on the surface soil, the debris flow will occur in the early heavy rain, and the probability of major floods will increase.

3. Rainwater cannot fully penetrate into the ground, resulting in a lack of fresh water on the surface.

4. The above reasons lead to difficulties in the survival of all animals, difficulties in the growth of other plants, and failure of crops. Food is scarce. To be precise, solar energy cannot be converted into chemical energy that can be absorbed, decomposed, and used by living organisms.

5. Lack of CO2 absorption, the greenhouse effect is more serious, and the oxygen in the atmosphere is depleted, which directly leads to the extinction of human beings.

The tree kingdom can improve the quality of the environment on which humans depend. The tree kingdom and green plants are constantly photosynthesizing, consuming carbon dioxide and producing fresh oxygen from trees. More than 60% of the oxygen in the air comes from trees and greenery on land.

Hence the metaphor of trees and greenery"Oxygen manufacturing plant"、"Fresh air processing plant"。There are also many trees in the tree kingdom that can secrete fungicides to kill various germs in the air; In addition, it can also absorb toxic gases emitted by industrial production, retained smoke and dust that pollute the atmosphere, and eliminate noise pollution harmful to humans.

In summer, people feel very different in the shade of trees and in direct sunlight. In summer, people feel cool in the shade of trees. This is due to the dense canopy of the trees, which blocks sunlight and absorbs the sun's radiant heat.

As a result, the temperature in the microenvironment is reduced. Trees are like huge pumping machines, which continuously absorb the water in the soil into the tree, and then diffuse most of the water absorbed by the roots into the atmosphere in the form of water vapor through the transpiration of the leaves, thus improving and regulating the relative humidity in the air.

Without trees, it can lead to soil erosion, flooding, strong winds, a significant drop in air quality, even more damage from typhoons, a warmer climate, melting snow and ice, and homeless animals. Lack of vegetation protection of surface soils, soil erosion, flash floods, mudslides, arid and desertified land. Arable land will be drastically reduced, some animals will become extinct, and food will be scarce for humans.

The Earth's oxygen is gradually decreasing and carbon dioxide is increasing, which can endanger the survival of animals and humans. At least the earth can't accommodate so many humans now. The above causes all animals to have difficulties in survival, other plants to grow, crops to fail, food scarcity, to be precise, that is:

Solar energy cannot be converted into chemical energy that can be absorbed, decomposed, and utilized by living organisms.

Hello, glad to answer for you. I will talk about the benefits of trees for human beings, so that you will know how much humanity would lose without them. Trees regulate the climate, purify the air, prevent wind and noise, and are man's best friend.

Trees are oxygen manufacturing plants. l hectare of broad-leaved forest can absorb 1 ton of carbon dioxide and release 0 73 tons of oxygen in 1 day.

Trees are dust filters. When a dusty air stream passes through a woods, the dust with larger particles in the air drops rapidly as the wind speed decreases. In addition, some trees have fluffy or oily skins that can stick to the body, thus reducing the dust content of the air flow through the trees.

Trees are good at sterilization. Many trees secrete cidin during their growth to kill various pathogens brought by dust. According to the survey, the amount of bacteria per cubic meter of air is 4 million in department stores, 580,000 on boulevards, 100 in parks, and only 55 in forest areas.

The difference in the amount of bacteria in the air between the forest area and the department store is more than 70,000 times.

In addition, trees are natural reservoirs and natural air conditioners.

It can lead to natural disasters such as sandstorms and typhoons.

The absence of trees will increase the greenhouse effect, pollute the atmosphere, and make it difficult for humans to survive.

If there were no trees, what would be the disaster for humanity?

If there were no trees, there would be nothing to withstand a tornado.

It is impossible to live without trees if there really are no trees on earth.

There was no one.

Rainwater does not penetrate the ground sufficiently, resulting in a lack of fresh water on the surface!

It will make the earth we live on no longer beautiful!!

Unexpected natural disasters affect the safety of our lives.

Quite simply, without trees, the soil will be sandy, the soil will be lost, sandstorms will be scraped, ultraviolet rays will be enhanced, and floods will be volatile, which will make the earth unbeautiful.

The Earth has lost vital oxygen**, and everyone knows that the photosynthesis of green leaves produces oxygen.

If there are no trees, the soil will be lost, the soil will be desertified, the land will become a desert, there will be no plant, and there will be no food for humans. Without trees, a large amount of land would become a desert, and people would be uninhabitable, and humanity would face the danger of losing its homeland.

Without trees, sandstorms and storms would be devastating to humanity. The trees are so deeply rooted in the soil that even a tornado can hardly uproot a tree in a large woods. The time under the storm is very long, and the trees are not afraid, but the leaves are greener!

If there were no trees, the storm would have washed away the house.

If there were no trees, the birds would have no home and the beasts would have no habitat. The bird will be on the verge of death.

Without trees, soil erosion will be severe, and subsidence disasters will occur.

Repeatedly, sub-fen.

No plants, no tools to generate oxygen, in a word, die.

The air is muddy, the sky is full of dust, in short, the earth will be destroyed.

What will be the disaster without the tree, and what will be the disaster?

It will cause a series of chain reactions, because the tree is a link in the biological chain, and if this link is gone, the corresponding links in the biological chain will be disordered, such as the desertification of the land, causing sand city storms. Birds are unable to inhabit, and extinction, as soon as the birds become extinct, there is a series of chain reactions.

Disasters such as sandstorms and mudslides occur.

The air in humans will slowly deteriorate, and you are willing to live in such a place.