Presentation on theme: "Warm-Up 1.How do you think life was different 1000 years ago compared to now? 2.What do you think was responsible for the change in the way we live our."— Presentation transcript:
Warm-Up 1.How do you think life was different 1000 years ago compared to now? 2.What do you think was responsible for the change in the way we live our lives now?
Warm-up In complete sentences, list three reasons why Mr. Sleep wants you to write today’s agenda in your notebook for THIS class.
Chapter 1 Section 1: Introduction to Environmental Science Part 2 9-1-2011
Learning Targets for 9-1-2011 Students will learn about the major environmental effects of hunter-gatherers, the agricultural revolution, and the Industrial Revolution. Students will distinguish between renewable and non- renewable resources. Students will know about the 3 different categories of environmental problems.
Our Environment Over Time How have we changed our environment over time? What city is this? What do you think it was like before this city came to be?
Our Environment Over Time Whenever humans have hunted, gathered, or grown food the environment changed. In just over 200 years the area of Chicago has changed immensely. How have we Changed Our Environment?
Three Causes of Change Hunter-gatherers Agricultural Revolution Industrial Revolution We will look at the effects on the environment and the characteristics of these changes.
Hunter- gatherers People who obtain food by collecting plants and by hunting wild animals or scavenging their remains. Groups were often small and they migrated depending on food sources and time of the year. These groups still exist in the amazon.
Hunter-Gatherers Affected their environments in many ways: Hunted bison, set fires to prevent growth of trees on prairies, disappearance of giant bison, giant sloth, cave bears etc. Climate change and over hunting lead to the extinction of several large mammals
Agricultural Revolution Agriculture is the practice of growing, breeding and caring for plants and animals Allowed human populations to grow at unprecedented rates Groups concentrated and placed great pressure on the environment
The Agricultural Revolution Changed the food we eat. Farmers started to collect seeds of plants with desired traits. Farmland replaced forests, grasslands and wetlands- many through slash and burn The destruction of land for farming resulted in soil loss, floods and water storage.
The Industrial Revolution In the mid 1700s a shift from energy sources like animals and water to fossil fuels occurred. The increased use of fossil fuels like oil & coal changed society and improved agricultural efficiency, transportation and industry. People left farming and cities became concentrated.
The Industrial Revolution Introduced positive changes- inventions like the light bulb Improved sanitation, nutrition, and medical care Technologies came like the telephone, personal computers and artificial materials Most of the problems studied in environmental science are associated with the Industrial Revolution and the increase in the human popultion
What are our environmental problems? We can generally group our environmental problems into three categories. Resource Depletion Pollution Loss of Biodiversity
Quick Question! What is the difference between a renewable and nonrenewable resource? Renewable resource- a resource that can be replaced by natural processes Nonrenewable resource- a resource that forms at a much slower rate than it is consumed.
Resource Depletion Natural Resources- any natural material used by humans Renewable and Non- renewable Both renewable and nonrenewable resources can be depleted
Pollution An effect of the industrial revolution- waste being produced faster than disposal Pollution- an undesired change in air, water or soil that can adversely affect health, survival or activities There are two main types of pollution Biodegradable and non- biodegradable
Loss of Biodiversity Biodiversity- the number and variety of species that live in an area Extinction- a natural process Mass Extinctions- large scale extinctions Organisms are natural resources Species are nonrenewable resources