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"Carbon Dioxide in Nature" Combustion and Fuel PPT Courseware (Lesson 1), 10 pages in total.
1. Introduction of new courses
As a high-quality energy source, fossil fuels have played a huge role in the development history of human civilization. It can be said that without fossil fuels, modern production and life would be impossible. However, in the past century, humans' large-scale exploitation and use of fossil fuels has led to a sharp decrease in their reserves, and has also led to an increase in CO₂ content in the atmosphere. What kind of gas is CO2? What impact will the increase in its content have on nature?
2. Changes in carbon dioxide content
[Question] Please carefully observe the shape and trend of the curve in the figure. What information can you get?
(1) How does the carbon dioxide content in the air change during the same year as reflected by the red curve in the picture? Does the same pattern of change repeat itself every year? what is the reason?
(2) What is the trend in changes in carbon dioxide content in the air in different years?
(3) What other information can you get from this picture?
①The same year: winter is higher than summer
② Different years: increasing year by year
①The vertical axis represents the proportion of CO2 in the atmosphere, that is, the volume of CO2 contained in every one million liters of air. The horizontal axis is time, and it can be read that the curve begins in 1958 and ends in 1994.
②The overall trend of the curve is upward, that is, the CO2 content increases with each year.
③The curve is zigzag-shaped, and the ups and downs of the zigzag are cyclical, always reaching a "peak" in winter and a "trough" in summer.
④The zigzag shape shows that the carbon dioxide content in winter is higher than in summer. This is because the photosynthesis of plants is weakened in winter, and fossil fuels are burned for heating, producing a large amount of CO2.
3. Carbon dioxide cycle in nature
[Question] Analyze the graph below to find out the possible reasons for the changes in carbon dioxide content in different years.
Observe the pictures and analyze the production and consumption of carbon dioxide
(1) How does CO2 circulate?
(2) What is the significance of the CO2 cycle to nature and human society?
(3) What are the possible reasons for the increase in CO2 content in the atmosphere year by year?
[Question] How to reduce carbon dioxide emissions?
Measures to reduce CO2 emissions:
① Reduce the use of fossil fuels such as coal, oil, and natural gas
②Develop and utilize clean energy such as solar energy, geothermal energy, wind energy, and hydrogen energy
③ Vigorously plant trees and strictly prohibit indiscriminate logging
4. Classroom exercises
1. International glacier experts recently pointed out: The glaciers in the Himalayas are gradually melting! The main cause of glacier melting is the "greenhouse effect", and the gas closely related to it is ( )
A.N2 B.O2 C.CO D.CO2
2. The Kyoto Protocol of the United Nations Framework Convention on Climate Change requires developed countries to limit CO2 gas emissions to control the increasingly serious "greenhouse effect." In order to slow down the increase of CO2 content in the atmosphere, the following suggestions are feasible ( )
①Develop new energy sources such as solar energy, wind energy, hydro energy, and geothermal energy
②The use of fossil fuels such as coal, oil, and natural gas is prohibited
③Plant a large number of trees and prohibit indiscriminate logging
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