Outline: Chapter 20.1: People and their Environments


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Grade 8 Integrated Science Chapter 20 Lesson 1 on people and their impact on the environment. This lesson is a short introduction of the positive and negative impact of human. Students should consider the net impact of the 7 billion people on earth and the effect that individuals can make.
*This outline follows the Chapter 20.1 presentation slides.

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Outline: Chapter 20.1: People and their Environments

  1. 1. Chapter 20 Lesson 1: People and the Environment –p718-722 - Page1 New Vocabulary • Population (719) – all the members of a species living in a given area • Carrying Capacity (720) – the largest number of individuals of a given species that Earth’s resources cam support and maintain for a long period of time Population and Carrying Capacity • For scientist, a population is all the members of a ______________ living in a given area. • We are a population of _________________! (hurray) • There are also ___________ and ____________ that make up separate populations in your area. The Human Population • Earth was once home to relatively few humans • Today, about ________________ billion people live on Earth. The greatest increase in human population occurred during the last few centuries Population Trends • A sudden rise in human population that has happened in recent history is called a ______________________ _____________________. • Look at the chart • What caused this sharp increase? o _______________________ o _________________________ o Technological advancements  In 1 hour about 15000 babies will be born
  2. 2. Chapter 20 Lesson 1: People and the Environment –p718-722 - Page2 Population Limits • All living things have certain needs. • What do humans need? • Where do all the materials we use for products come from? • Does Earth have enough resources to support an unlimited number of humans? • Earth has limited resources o It cannot support a population of any species in a given environment beyond its carrying capacity • Carrying capacity is the largest number of individuals of a given species that earth’s resources can support and maintain for a ___________ ______________. o If the human population continues to grow beyond Earth’s carrying capacity, eventually Earth’s _______________________ will run out. Impact of Daily Actions • As of 2012, the human population is _____________________ billion o Everyone is using resources o Think, everyday people should be drinking 2-3 liters of liquids a day o That’s 14,000,000,000L of liquid consumed in a day used just for drinking (if everyone got the necessary amount) Consuming Resources • Like most people, I hope you are taking a shower every day. What resources are needed to make that happen? o The _____________________ in the pipes are obtained through mining, which causes pollution and destroys habitats o ____________________ is needed to transport those metals, which releases pollution into the atmosphere o You probably use a _____________________ towel. Fertilizers often used to grow crops run off into water and affect overall water quality • Think about all the activities you do in a week and the resources needed to make them possible. Then, multiply that by 7 billion. o This why using resources wisely, even at a personal level, can help Earth Positive and Negative Impacts • Not all human activities have a negative impact on the environment. • What are some positive and negative impacts of humans?