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Chapter 20: Problem 12

Describe the mechanisms by which human population growth and resource use causes increased extinction rates.

Short Answer

Expert verified
Increased human population growth and resource use leads to increased extinction rates through several mechanisms. First, as human populations grow and our demand for resources increases, we exploit these resources in disruptive ways, leading to habitat loss. This can put pressure on many species and lead to increased extinction rates as their population becomes fragmented or they are unable to adapt quickly enough to changing conditions. Specific examples include deforestation for agriculture or urban development, overfishing, pollution, and climate change.

Step by step solution

01

Unpack Human Population Growth

Begin by understanding what is meant by 'human population growth'. In general terms, this refers to the increase in the number of individuals that make up the human species globally. This has direct consequences on our environment as it leads to increased demand for resources and space.
02

Understanding Resource Use

Next, try to grasp what is meant by 'resource use'. This includes not only consumption of natural resources like water, air, soil, minerals, and fossil fuels, but also includes impacts on the biodiversity, ecosystems and related services. Humans depend on these resources for survival and development which continually increases with population growth.
03

Connect Population Growth and Resource Use to Increased Extinction Rates

Now, it's time to connect the dots between population growth, resource use and extinction rates. As human populations grow and our demand for resources increases, we are often driven to exploit these resources in a manner that can disrupt ecosystems and lead to habitat loss. This can put a pressure on many species and may lead to increased extinction rates as their populations become fragmented, they lose genetic diversity, or they are unable to adapt fast enough to changing conditions.
04

Examples of Mechanisms

Here, a few concrete examples of such mechanisms can be presented. For instance, deforestation for agricultural expansion or urban development often removes habitat necessary for the survival of various species. Overfishing can severely deplete fish populations, making them more vulnerable to environmental changes. Pollution can also lead to loss of biodiversity by creating inhospitable conditions for various species. Climate change, driven by human activity, alters habitats and can lead to extinctions as well.

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