Human Influence
Desertification
Desertification, or the spread of deserts, is a growing environmental issue. Over the past several decades, the amount of land classified as desert (based on average precipitation, temperatures, and landforms) has grown. Between 1882 and 1952, proportions of Earth's land surface classified as desert rose from 9.4 to 23.3 percent (Whitfield 156).
Two main causes scientists link to the spread of deserts are climate changes and mismanagement of land. Many believe that humans play a role in these factors.
Two main causes scientists link to the spread of deserts are climate changes and mismanagement of land. Many believe that humans play a role in these factors.
Climate Change |
A decrease in rainfall combined with increased global temperatures have likely contributed to the rise in deserts across the globe. It is possible that humans have influenced today's climate changes through pollution and waste.
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Mismanaged Land |
The environment of the Great Basin has changed over the years as farmers built ranches in the area.
Part of what classifies any geographical location as a desert depends on the amount of vegetation growing in the area. A lack of vegetation in several areas across the globe has contributed to desertification. Overgrazing is a large part of the problem, and humans have played a role in this issue. Increased livestock that began when ranchers first arrived in the area has affected the landscape. In order to keep up economically, many farmers and ranchers have left livestock to graze during droughts and famines (Whitfield 66). Also, humans have carried out deforestation, or cutting down trees. When left unregulated, this mismanagement of land has contribute to desertification. Finally, transportation has disturbed plant growth and encouraged the growth of weeds (The Great Basin and Invasive Weeds). |
It is important that humans recognize their role in the existence and preservation of such ecosystems as the Great Basin.
The information on this page came from the book Biomes and Habitats. Picture was found on the National Park Service Explore Nature website.