"Intensifying Environmental Problems" Facing Unprecedented Challenges Together PPT Courseware

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"Intensifying Environmental Problems" Facing Unprecedented Challenges Together PPT Courseware

Part One: The Origin of Environmental Problems

In the process of developing and utilizing natural resources, people will affect the environment in which humans and other organisms live.

1. When this impact is within the carrying capacity of the natural environment, humans can maintain a relatively coordinated relationship with the natural environment.

2. The root cause of environmental problems: When this impact exceeds the carrying capacity of the natural environment, conflicts will arise between humans and the natural environment, and various environmental problems will arise.

Increasing environmental problems PPT, part 2: changes in environmental problems

Environmental problems have existed since ancient times, but their specific content has changed with social development, and the degree and scope of their impact have also varied greatly.

1. Prehistoric society: Due to low productivity, human beings have limited ability to transform nature, and are highly dependent on nature and less destructive.

2. Agricultural society: Human beings began to consciously transform nature, resulting in environmental problems such as soil erosion and desertification.

Agricultural society - Meteorological disasters such as volcanoes, earthquakes, mudslides, typhoons, tsunamis, and heavy rains cause damage to agricultural production, soil erosion, and environmental degradation.

3. Industrial society: After the industrial revolution, while promoting economic development, regional environmental pollution and large-scale ecological destruction occurred from time to time. In addition, large-scale and global environmental crises such as the greenhouse effect, ozone layer depletion, acid rain, species extinction, land desertification, sharp forest loss, and solid waste pollution have emerged, seriously threatening human survival and development.

Characteristics: In prehistoric society, humans gathered and hunted together; in agricultural society, people farmed; in industrial society, people worked hard to conquer nature.

Environmental problems have existed since ancient times. The main environmental problem in prehistoric society was the destruction of biological resources. Environmental problems such as soil erosion and land desertification have occurred in agricultural societies. Regional environmental pollution and large-scale ecological destruction occur from time to time in industrial society. In addition, large-scale and global environmental crises such as the greenhouse effect, ozone layer destruction, and land desertification have emerged.

The specific content of environmental problems varies with social development, and the degree and scope of impact also vary greatly. Human beings have an increasing impact on the natural environment, so environmental problems are becoming more and more serious.

Increasing environmental problems PPT, the third part: three levels of environmental problems

There are three levels of environmental problems. The first level is local environmental problems: they are usually limited to a region or country and show regional characteristics; the second level is regional environmental problems: they are cross-regional and have a certain degree of transmissibility and pollutants. Cross-border transfer characteristics caused by diffusion; the third level is global environmental problems: it has a global integrity, and its impact threatens the stability and security of the entire earth's ecosystem.

The large amounts of chlorofluorocarbons emitted by humans into the atmosphere destroy ozone in the ozone layer. After the ozone layer is destroyed, its ability to absorb ultraviolet rays is greatly reduced, which will seriously harm human health and the ecological environment.

Based on the above information, analyze the characteristics of the scope of influence of these environmental problems and what harm they will cause.

These are all global environmental issues.

To human health: Seriously harmful to human health.

For economic development: directly restricts economic development.

To the ecological environment: threaten the ecological balance and destroy the ecological environment.

Increasing environmental problems PPT, Part 4: Coping with global environmental problems

1. Many global environmental problems are no longer purely environmental problems, but are closely linked to a country's politics, economy and security.

2. It is difficult for one country or region to solve the problem alone and requires the cooperation of all countries in the world.

3. While countries pay close attention to their own environment, they should also pay full attention to regional and global environmental issues.

Countries around the world are actively taking measures to reduce carbon dioxide emissions. Add what you know.

China has incorporated “energy conservation and emission reduction” into its national development plan

BP announces plans to cut CO2 emissions and invest in solar energy

Japanese car company produces hybrid car

Denmark uses wind energy to generate 8% of its total electricity.

Increasing environmental problems PPT, part five: expansion and improvement

Causes of environmental problems

Natural factors: generally caused by regional climate, extreme weather, natural disasters, etc. For example, the legendary flood control by Dayu in my country reflects from one aspect the major environmental problems that occurred at that time - floods.

Human factors: In the process of developing and utilizing natural resources, people's influence exceeds the carrying capacity of the natural environment. Conflicts will arise between humans and the natural environment, and various environmental problems will arise (as shown in the figure).

Note: The self-purification ability of the environment is the ability of the environment to accommodate and remove excreta from human production and life. Arrow a in the figure represents the feedback effect of the environment on humans, and arrow b represents the impact of humans on the environment.

① The speed at which humans demand resources from the environment exceeds the speed at which resources are replenished, regenerated, and multiplied, which will lead to an imbalance in ecological balance, that is, ecological destruction.

②When the amount of waste discharged by humans into the environment exceeds the self-purification capacity of the environment, environmental pollution problems will occur.

Increasing environmental problems PPT, part 6 content: Class summary

cause:

When humans' impact on the natural environment exceeds the carrying capacity of the natural environment, conflicts will arise between humans and the natural environment, and various environmental problems will arise.

Category: Ecological damage and environmental pollution

Variety

prehistoric society

Agricultural Society

Industrial society

three levels

local environmental problems

regional environmental issues

global environmental issues

harm

To human health: Seriously harmful to human health.

For economic development: directly restricts economic development.

To the ecological environment: threaten the ecological balance and destroy the ecological environment.

Countermeasures: Countries around the world need to pay attention and work together

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For more information about the PPT courseware "Working Together to Face Unprecedented Challenges and Increasing Environmental Problems", please click the "Working Together to Face Unprecedented Challenges and Increasing Environmental Problems" ppt tag.

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Update Time: 2024-07-06

This template belongs to History courseware People's Education Edition History and Society 9th Grade Part II industry PPT template

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