Section outline

  • THEMATIC FOCUS

    Humans and the Environments ENV
    The environment shapes human societies, and as populations grow and change, these populations in turn shape their environments.

    LEARNING OBJECTIVE

    Unit 9: Learning Objective C
    Explain the causes and effects of environmental changes in the period from 1900 to present.

    HISTORICAL DEVELOPMENTS

    KC-6.1.II.A
    As human activity contributed to deforestation, desertification, a decline in air quality, and increased consumption of the world’s supply of fresh water, humans competed over these and other resources more intensely than ever before.

    KC-6.1.II.B
    The release of greenhouse gases and pollutants into the atmosphere contributed to debates about the nature and causes of climate change.