"The Impact of Human Activities on the Biosphere" PPT

Description

"The Impact of Human Activities on the Biosphere" PPT

Part I: Impacts of land use on the biosphere

Land is a priceless treasure given to mankind by nature and the material basis on which mankind depends for survival.

At present, among the many ecological and environmental problems in our country, the problem of land desertification is the most serious. There are currently 1.689 million square kilometers of desertified land in the country, accounting for 17.6% of the country's land area, involving nearly a thousand counties (banners) across the country. The expansion rate of land desertification is 2,460 square kilometers per year, which is equivalent to the "disappearance" of a medium-sized county in land area every year.

Of the 1.6 billion tons of sediment deposited in the Yellow River every year, 1.2 billion tons come from sandy areas.

Land desertification has caused serious harm to my country's economic and social development. According to expert estimates, direct economic losses caused by desertification nationwide are 54 billion yuan every year.

PPT on the impact of human activities on the biosphere, part 2: What are the root causes of land desertification?

Experts have discussed this a lot. According to research, large areas of land desertification in my country are caused by both climate and unreasonable human activities. The "most important reasons" are: rapid population growth, irrational use of land in some areas under the dual pressure of population and economic development, blind reclamation, overgrazing of pastures, indiscriminate deforestation, indiscriminate mining and unreasonable water resources The utilization phenomenon is serious and a large amount of desert vegetation is destroyed, resulting in the continuous expansion of desertified land.

The world's population is increasing rapidly, and land is under unprecedented pressure. The unscientific and unrestricted use of land has caused soil erosion and reduced land quality, which has seriously affected the stability of the biosphere. It will not only endanger the current generation, but also harm future generations.

Human beings can no longer treat the land as a conqueror. Instead, they should actively protect it while using it rationally, establish a harmonious relationship between people and the land, and promote the harmonious development of humans and the land.

PPT on the impact of human activities on the biosphere, part 3: Impact of deforestation on the biosphere

The role of forests:

Conservate water sources, maintain water and soil, prevent wind and sand, increase humidity, create oxygen, purify the air, and reduce noise

The destruction of forests has brought serious consequences, not only causing a lack of forest resources, but also destroying animal habitats, putting many species on the verge of extinction, and causing global climate deterioration, severe soil erosion, and frequent land desertification. floods and droughts, etc.

Protecting, restoring, and expanding forest resources are issues of common concern to all countries around the world and are fundamental measures to maintain the stability of the biosphere. The earth needs forests, and humans crave green. For the sake of a green earth, let us take active actions to protect every green leaf.

Keywords: Beijing Normal University Edition Biology PPT courseware for seventh grade volume 2 free download, PPT download on the impact of human activities on the biosphere, .PPT format;

For more information about the PPT courseware "Man's Responsibilities in the Biosphere and the Impact of Human Activities on the Biosphere", please click the "Man's Responsibilities in the Biosphere ppt Impact of Human Activities on the Biosphere" ppt tag.

"The Impact of Human Activities on the Biosphere" PPT courseware download:

"The Impact of Human Activities on the Biosphere" PPT courseware download Part One: New Lesson Introduction So far, the earth is the only place we have found suitable for the survival of various organisms, and it is also the only place suitable for human survival. Humans are not just a member of the biosphere...

"The Impact of Human Activities on the Biosphere" PPT download:

"The Impact of Human Activities on the Biosphere" PPT Download Part One: Introduction of New Lessons So far, the earth is the only place we have found suitable for the survival of various organisms, and it is also the only place suitable for human survival. Humans are not only members of the biosphere, but...

"Developing a plan to protect the ecological environment" The impact of human activities on the biosphere PPT courseware 5:

"Developing a plan to protect the ecological environment" The impact of human activities on the biosphere PPT courseware 5 Practice using waste paper to make recycled paper 1. Cut an old newspaper or used homework paper into scraps and soak it in clean water. 2. Combine the soaked paper scraps with water and starch..

File Info

Update Time: 2024-10-05

This template belongs to biology courseware Beijing Normal University Edition Seventh Grade Biology Volume 2 industry PPT template

Preview