Human Impact

3. revolution leading to an increase in medical understanding that led to prolonging the lives of humans
6. The science of planting and caring for forests and the management of growing timber
7. the process or industry of obtaining coal or other minerals from a mine.
8. reduction in the number or quantity of something
9. The use of Earth's renewable and nonrenewable natural resources in ways that do not constrain resource use in the future.
11. farming for the raising of livestock (particularly cattle)
12. revolution leading to a dramatic social change in important structures brought about relatively quickly by the introduction of new technology
14. the amount of food required to feed a population. Food demand increases as populations increase
16. revolution when human beings first domesticated plants and animals and no longer relied entirely on hunting and gathering
18. the amount of food that is available to the population.
19. the cultivation of a single crop in a given area.
21. the process by which fertile land becomes desert, typically as a result of drought, deforestation, or inappropriate agriculture.

1. refers to a decrease in the pH of the ocean over an extended period of time, caused primarily by uptake of carbon dioxide (CO2) from the atmosphere
2. an undesirable in the natural environment that is caused by the introduction of substances that are harmful to living to organisms or by excessive wastes, heat, noise, or radiation
4. an increase in the ratio or density of people living in urban areas rather than in rural areas
5. revolution of rapid growth in the use of machines in manufacturing and production that began in the mid-1700s
6. the capture of wild fish and other seafood living in the waters
8. the process of removing salt from seawater
10. A form of oxygen that has three oxygen atoms in each molecule; when not in the stratosphere, it is an unstable toxic gas with a pungent odor and powerful oxidizing properties
13. refers to the biosphere, or all the spaces on earth occupied by living organisms
15. the practice of growing, breeding, and caring for plants and animals that are used for food, clothing, housing, transportation, and other purposes
17. Organisms that have been genetically altered to improve their usefulness
20. urban air pollution composed of a mixture of smoke and fog produced from industrial pollutants and burning fuels