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Warm-UpHow do you think life was different 1000 years ago compared to now?What do you think was responsible for the change in the way we live our lives now?Warm-upIn complete sentences, list three reasons why Mr. Sleep wants you to write todays agenda in your notebook for THIS class.Review Question Discussion pg. 8 1-4

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Chapter 1 Section 1:Introduction to Environmental SciencePart 29-1-2011Learning Targets for 9-1-2011Students 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 TimeHow 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 TimeWhenever 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 ChangeHunter-gatherers

Agricultural Revolution

Industrial RevolutionWe will look at the effects on the environment and the characteristics of these changes.

Hunter-gatherersPeople 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-GatherersAffected 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 mammalsAgricultural RevolutionAgriculture 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 RevolutionChanged the food we eat.Farmers started to collect seeds of plants with desired traits.Farmland replaced forests, grasslands and wetlands- many through slash and burnThe destruction of land for farming resulted in soil loss, floods and water storage.The Industrial RevolutionIn 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 RevolutionIntroduced positive changes- inventions like the light bulbImproved sanitation, nutrition, and medical careTechnologies came like the telephone, personal computers and artificial materialsMost of the problems studied in environmental science are associated with the Industrial Revolution and the increase in the human popultionWhat are our environmental problems?We can generally group our environmental problems into three categories.Resource Depletion

Pollution

Loss of BiodiversityQuick Question!What is the difference between a renewable and nonrenewable resource?Renewable resource- a resource that can be replaced by natural processesNonrenewable resource- a resource that forms at a much slower rate than it is consumed.

Resource DepletionNatural Resources- any natural material used by humansRenewable and Non-renewable Both renewable and nonrenewable resources can be depleted

PollutionAn effect of the industrial revolution- waste being produced faster than disposalPollution- an undesired change in air, water or soil that can adversely affect health, survival or activitiesThere are two main types of pollutionBiodegradable and non-biodegradable

Loss of BiodiversityBiodiversity- the number and variety of species that live in an areaExtinction- a natural processMass Extinctions- large scale extinctions

Organisms are natural resourcesSpecies are nonrenewable resources