End Show Slide 1 of 21 Biology Mr. Karns A changing Landscape

End Show Slide 2 of A Changing Landscape

End Show 6-1 A Changing Landscape Slide 3 of 21 Earth as an Island All organisms on Earth share a limited resource base and depend on it for their long-term survival. To protect these resources, we need to understand how humans interact with the biosphere.

End Show 6-1 A Changing Landscape Slide 4 of 21 Human Activities What types of human activities can affect the biosphere?

End Show 6-1 A Changing Landscape Slide 5 of 21 Human Activities From the ecosystems in which they live, humans obtain such necessities as clean water and recycled nutrients. Ecologists refer to such necessities as “ecosystem goods and services” because they have value to individuals and societies.

End Show 6-1 A Changing Landscape Slide 6 of 21 Human Activities Some human activities that affect the biosphere include: hunting and gathering agriculture industry urban development

End Show 6-1 A Changing Landscape Slide 7 of 21 Hunting and Gathering For most of history, humans obtained food by hunting and gathering. Today, groups of people in scattered parts of the world still follow the hunter-gatherer way of life.

End Show 6-1 A Changing Landscape Slide 8 of 21 Agriculture Agriculture is the practice of farming. It includes the production of crops and the raising of livestock. Agriculture provides human societies with a dependable supply of food that can be produced in large quantity and stored for later use.

End Show 6-1 A Changing Landscape Slide 9 of 21 Agriculture From Traditional to Modern Agriculture In the 1800s and 1900s, advances in science and technology set the stage for a remarkable change in agriculture.

End Show 6-1 A Changing Landscape Slide 10 of 21 Agriculture Large-scale irrigation turned deserts into fertile farmlands. New machinery helped farmers increase yields. New varieties of crops produced higher yields. Chemical fertilizers boosted plant growth. Pesticides controlled crop-damaging insects.

End Show 6-1 A Changing Landscape Slide 11 of 21 Agriculture New crops were often grown using a practice called monoculture, in which large fields are planted with a single variety of crop year after year.

End Show 6-1 A Changing Landscape Slide 12 of 21 Agriculture The Green Revolution The green revolution was an effort in the mid- twentieth century to increase global food production through modern plant breeding and agricultural techniques. Over the last 50 years, the green revolution has helped world food production double.

End Show 6-1 A Changing Landscape Slide 13 of 21 Agriculture Challenges for the Future While increasing world food supplies, modern agriculture has created ecological challenges. For example: Monoculture leads to problems with insect pests and diseases. Finding enough water for irrigation is difficult.

End Show 6-1 A Changing Landscape Slide 14 of 21 Industrial Growth and Urban Development Human society and its impact on the biosphere were transformed by the Industrial Revolution, which added machines and factories to civilization.

End Show 6-1 A Changing Landscape Slide 15 of 21 Industrial Growth and Urban Development The energy to power machinery comes mostly from fossil fuels—coal, oil, and natural gas. Industrial growth and urban development affect both the local and global environment. Discarded industrial waste pollutes air, water, and soil. Dense human communities also produce waste. Suburban growth consumes farmland and stresses native plants and animals.

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End Show Slide 17 of Today, the most important source of environmental change on the planet is a.the green revolution. b.wild plants. c.humans. d.abiotic factors.

End Show Slide 18 of The practice of planting a single crop in the same place year after year is called a.uniculture. b.monoculture. c.the green revolution. d.plant breeding.

End Show Slide 19 of One problem with modern agriculture is that a.chemical fertilizers don’t work. b.chemical pesticides can damage beneficial insects. c.it has decreased world food production. d.new varieties of plants require little water.

End Show Slide 20 of One impact of early hunting and gathering groups in North America might have been a.changing the climate from very cold to much warmer. b.the elimination of forests. c.a mass extinction of large mammals about 12,000 years ago. d.the development of large civilizations in Central and South America.

End Show Slide 21 of Most of the energy for industry comes from a.the sun. b.nuclear power plants. c.moving water. d.fossil fuels.

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