"Environmental Issues and Our Actions" Environment and Us PPT Courseware 3

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"Environmental Issues and Our Actions" Environment and Us PPT Courseware 3

What is air pollution?

Air pollution usually refers to the phenomenon of certain substances entering the atmosphere due to human activities or natural processes, showing sufficient concentration for a sufficient period of time, and thus endangering human comfort, health or environmental pollution.

What practices pollute the atmosphere?

1. Industrial waste gas, waste emissions, and automobile exhaust emissions.

2. Natural causes (such as forest fires, volcanic eruptions, etc.)

3. Burning wheat straw, rice straw, etc.

How is air pollution formed?

Once pollutants enter the atmosphere, they will dilute and spread. The stronger the wind, the stronger the atmospheric turbulence, the more unstable the atmosphere, and the faster the dilution and diffusion of pollutants; on the contrary, the slower the dilution and diffusion of pollutants. Although precipitation can purify the atmosphere, as pollutants fall with rain and snow, air pollution will turn into water pollution and soil pollution.

The harm of air pollution to human health

First, it feels uncomfortable, and then symptoms of acute harm appear. The harm of air pollution to humans can be roughly divided into three types: acute poisoning, chronic poisoning, and carcinogenesis.

The harm of air pollution to industrial production

One is corrosion of industrial materials, equipment and building facilities.

Second, the increase in flying dust has adverse effects on the production, installation, commissioning and use of precision instruments and equipment. At the same time, it increases the cost of production, increases the cost, and shortens the service life of the product.

The harm of air pollution to agricultural production

Acid rain can directly affect the normal growth of plants, and can also cause acidification of soil and water bodies and the dissolution of toxic components by seeping into soil and water bodies, thereby poisoning animals, plants and aquatic organisms. Severe acid rain will cause forest decline and fish extinction.

Discussion: Faced with the serious harm caused by these air pollution to human beings, what measures should we take?

1. Many countries have formulated corresponding laws and regulations to reduce exhaust gas and waste emissions and strictly control vehicle exhaust emission standards.

2. Promote the “Car-Free Day” activity.

3. Drive less and try to take buses or choose environmentally friendly transportation.

4. It is forbidden to burn wheat straw and rice straw

What is white pollution?

The so-called "white pollution" is an image term for people's environmental pollution caused by plastic waste. It is a phenomenon in which various domestic plastic products are discarded into solid waste after use. Because they are thrown randomly and are difficult to degrade, they cause serious environmental pollution.

Discussion: Why does this phenomenon occur?

1. People throw away waste everywhere;

2. People use disposable plastic bags;

3. Does not rot or degrade.

What is degradable plastic? What are the degradable plastics in our lives? Which ones are non-degradable?

1. Biodegradable plastics refer to plastics that can degrade themselves in a short period of time under natural conditions by adding a certain amount of additives during the production process.

2. Environmentally friendly lunch boxes, environmentally friendly plastics, etc.

3. Soda bags, ordinary plastic bags, etc.

Causes of species extinction

Man-made destruction of the environment: Animals often only adapt to a specific living environment. Once the environment changes, such as forests being cut down, the animals that originally lived here will face great danger.

Pollution: Pollution is the most serious problem faced by wild animals. Pollution destroys the environment where living things such as water and air depend for survival, causes global climate change, and changes the original living environment of animals.

Humans hunt indiscriminately.

Why are they rare?

Due to the massive destruction of global forests and the deterioration of the marine environment, human beings have indiscriminate hunting and over-exploitation and utilization, many biological resources are on the verge of exhaustion.

Environmental issues and our actions

Q&A

Faced with these environmental problems, as primary school students, what should we do?

1. Do not discard waste casually;

2. Reduce the use of disposable plastics and try to use environmentally friendly plastic bags, etc.;

3. Dissuade parents from burning straw;

4. Use environmentally friendly transportation;

5. Live in harmony with animals and plants, and avoid indiscriminate hunting and killing;

6. Classify garbage and recycle it;

7. Strive to be a small guardian of environmental protection and actively promote environmental protection knowledge.

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Update Time: 2024-11-22

This template belongs to science courseware Science Edition for Sixth Grade Science Volume 2 industry PPT template

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