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

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?