PBA 1 - Enviromental Changes Timeline

By Lanasablan

  • Industrial Revolution

    Industrial Revolution
    In the mid 1700's & 1800s
    1.1709 - Abraham Darby uses coke to smelt iron ore, replacing wood and charcoal as fuel.
    2. October 22, 1879 - The Light bulb was invented
    3. Energy sources shifted from animal muscle and running water to fossil fuels, such as coal and oil.

  • Hunter Gatherers

    Hunter Gatherers
    1. 80,000 to 70,000 years ago, some hunter-gatherers bands began to specialize, concentrating on hunting a smaller selection of game and gathering a smaller selection of food.
    2. Humans migrated from place to place as different types of food became available at different times of the year.
    3. Evidence suggests big-game hunter gatherers crossed the Bering Strait from Asia (Eurasia) into North America over a land bridge (Beringia), that existed between 47,000–14,000 years ago.

  • Agricultural Revolution

    Agricultural Revolution
    5,000 - 4,000 B.C.
    1.The agricultural revolution changed the food we eat.
    [ it became much much better ]
    2. the 19th century as a direct result of a population increase caused by the Agricultural Revolution which led to much larger armies.
    3. the population increase meant that there were more poor people,as they made up the largest proportion of society.

  • 21st Century

    21st Century
    1. We produce more waste then before
    2. The population has increased
    3. Resources are limited now,due to overusing them.