Getting 5 Stars In 9 Weeks Biology Chapter 12 E
1
Chapter
Applied Ecology
WEEK
12
Applied Ecology
1
2
12.1 Human Impact on the Environment
3
4
Pattern of human population growth
5
6
7
8
9
影響人口增長的因素包括：生育率 (birth rate) 、死亡率 (death rate) 、移入 (immigration) 及移出
(emigration) 。
© 2014 Hong Kong Educational Publishing Co.
2
Getting 5** in 9 Weeks: Biology
•
Reasons for abrupt increase in human population after mid-17th century:
– improved farming techniques, better storage
– improved technologies
– control of infectious diseases
– advances in medical care
– improved quality of life
Impact of rapid human population growth
Impact
Causes
Food crisis
Populations increase in an exponential rate
– Rate of food consumption > Rate of food production
– Shortage of food for human
Pollution problem
The increased population and industrialization have produced wastes much faster than the environment can absorb or recycle.
Depletion of natural resources 1. Exhaustion of non-renewable resources: coal, oil, minerals
2. Overexploitation of renewable resources: fishery, forestry
Destruction of natural environment
Agriculture and urban development need clearance of lands
– Destruction of scenery
– Removal of vegetation cover
• Hence, population control is needed to ensure a sustainable supply of natural resources and conservation of the environment.
Types of resources
Renewable
resources
Resources that can be regenerated by natural processes as quickly as they are used up, e.g. food or materials derived from plants, animals, timber, sunlight, wind and tidal power.
Non-renewable resources Resources that cannot be regenerated or can only be regenerated by natural processes over extremely long period of time, e.g. fossil fuels
(e.g. coal, natural gas and petroleum) and metals (e.g. gold, iron and copper). © 2014 Hong Kong Educational Publishing Co.
3
Fisheries, agriculture and forestry
• Fisheries is the practice of capturing wild fish or rearing fish or other aquatic organisms
Chapter
Applied Ecology
WEEK
12
Applied Ecology
1
2
12.1 Human Impact on the Environment
3
4
Pattern of human population growth
5
6
7
8
9
影響人口增長的因素包括：生育率 (birth rate) 、死亡率 (death rate) 、移入 (immigration) 及移出
(emigration) 。
© 2014 Hong Kong Educational Publishing Co.
2
Getting 5** in 9 Weeks: Biology
•
Reasons for abrupt increase in human population after mid-17th century:
– improved farming techniques, better storage
– improved technologies
– control of infectious diseases
– advances in medical care
– improved quality of life
Impact of rapid human population growth
Impact
Causes
Food crisis
Populations increase in an exponential rate
– Rate of food consumption > Rate of food production
– Shortage of food for human
Pollution problem
The increased population and industrialization have produced wastes much faster than the environment can absorb or recycle.
Depletion of natural resources 1. Exhaustion of non-renewable resources: coal, oil, minerals
2. Overexploitation of renewable resources: fishery, forestry
Destruction of natural environment
Agriculture and urban development need clearance of lands
– Destruction of scenery
– Removal of vegetation cover
• Hence, population control is needed to ensure a sustainable supply of natural resources and conservation of the environment.
Types of resources
Renewable
resources
Resources that can be regenerated by natural processes as quickly as they are used up, e.g. food or materials derived from plants, animals, timber, sunlight, wind and tidal power.
Non-renewable resources Resources that cannot be regenerated or can only be regenerated by natural processes over extremely long period of time, e.g. fossil fuels
(e.g. coal, natural gas and petroleum) and metals (e.g. gold, iron and copper). © 2014 Hong Kong Educational Publishing Co.
3
Fisheries, agriculture and forestry
• Fisheries is the practice of capturing wild fish or rearing fish or other aquatic organisms