"The Destruction of the Rainforest—A Worldwide Disaster" PPT Courseware 2

Description

"The Destruction of the Rainforest—A Worldwide Disaster" PPT Courseware 2

teaching objectives

1. Fully understand the important position of "rainforest" in the ecological environment and enhance students' environmental awareness.

2. Master the explanation methods such as listing data, making comparisons, and giving examples used in the text.

3. Improve students’ interest and ability in reading popular science articles.

1. Perception of the full text

Quickly read the entire text to accumulate words and think about it

1. What is the current status of the rainforest?

2. What kind of disaster will the disappearance of rainforest bring to mankind?

word accumulation

on the verge of bīn lín perch ashes

domestication severe cancer

ingest slash and burn

Answer the following questions:

1. What is the current situation of the rainforest?

Currently, the rainforest is suffering from indiscriminate deforestation by humans, and it has become the most severely damaged ecological area. The first paragraph of the article tells us: “The rainforest is completely destroyed at a rate of 270,000 square meters per minute. Every year, a rainforest the size of New York State disappears forever.

2. What kind of disaster will the disappearance of rainforest bring to mankind?

1. It means that people will lose a large number of species forever;

2. It means that the atmosphere on which people live will suffer serious damage, which will intensify the trend of global warming; the disappearance of rainforests will also lead to soil erosion and flooding;

3. If the rainforest is completely destroyed, the earth is likely to experience the sixth mass extinction by the middle of the next century.

2. Clarify your thoughts

Because 1, (paragraph 1) The rainforest is being completely destroyed at a rate of 270,000 square meters per minute.

Fruit 1, (paragraph 2-5) The disappearance of the rainforest means that humans will lose a large number of species.

Fruit 2, (paragraphs 6-10) The destruction of the diversity of life on earth means the destruction of the atmosphere on which people rely for survival.

Fruit 3, (paragraphs 11-13) If the rainforest is completely destroyed, the earth may experience the sixth mass extinction by the middle of the next century.

Why do humans destroy rainforests?

Superficial reasons

(1) Logging companies cut down large numbers of trees and transport hardwood lumber to various countries for sale.

(2) Land expansion and the practice of building new pastures in rainforest areas are also common

deeper reason:

(1) Driven by monetary interests.

(2) Lack of ecological ethics of sustainable development.

(3) Population is exploding and natural resources are insufficient.

(4) The economic development of various countries is uneven and there is a lack of coordinated and unified actions.

1. What is photosynthesis? What method of explanation did the author use?

The process by which green plants absorb light energy, carbon dioxide and water, create organic matter and release oxygen is called photosynthesis

2. What harm will excess carbon dioxide bring?

Rising global temperatures; melting glaciers, flooding

3. What are the dual consequences of slash-and-burn cultivation?

Cutting down trees will reduce the photosynthesis of the rainforest, ultimately causing an increase in the concentration of carbon dioxide in the atmosphere and reducing the amount of necessary oxygen in the atmosphere. In addition, setting fire to deforestation will produce a large amount of carbon dioxide, causing further deterioration of the environment.

Language of taste:

Can the red words be removed from the following sentences? Why?

1. At least 2,500 potential new fruits and vegetables are growing in tropical rainforests around the world.

cannot. "At least" means there are at least 2,500 potential new fruits and vegetables growing in tropical rainforests around the world. The actual number will be more than 2,500. This shows that plants in tropical rainforests are valuable resources for humans to obtain more food.

2. The most severe one occurred about 245 million years ago in the Permian.

cannot. "Approximately" indicates an estimated number, which is not very precise about the time. If it is removed, the accuracy of the explanation will be lost.

3. We have lost forever the Darwinian moth, which had a tongue more than 20 centimeters long and was capable of sucking sap from a special species of orchid.

cannot. "Forever" indicates that this species has become extinct, and also implies the author's regret and helplessness about the extinction of the species.

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For more information about the PPT courseware "A Worldwide Disaster Destroying the Rainforest", please click the "A Worldwide Disaster Destroying the Rainforest" ppt tag.

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Update Time: 2024-07-04

This template belongs to Chinese courseware Chinese version of eighth grade Chinese language volume 1 industry PPT template

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