Environmental Science Discussion: Keystone Species; Invasive Species

Ch.4

Question 6

The term keystone species means a special status of species in the eyes of ecologists because they have a significant impact on the types and abundances of other species in the whole ecosystem (Withgott & Laposata 101). In other words, they play a vital role in maintaining ecological structure of the environment and the ecological community is general. The types of organisms that are most often considered as keystone species are the plants that produce flowers or fruit in critical periods to help other species to survive; soil cyanobacteria which can support the survival of snail species through provision of nitrogen; badgers and ants which help to provide soil modification.

Question 4

Scientists consider invasive species to be a problem because they pose a serious threat to the ecological community’s stability (Withgott & Laposata 108). Actually, this threat is posed by habitat loss. As a result, invasive species cause serious ecological and economic problems as they cause damage to shorelines, man-made facilities, ships, machinery, etc. Their offensive nature makes a species “invasive” as they contribute to reduction of biodiversity through parasitizing and causing diseases. As a result, invasive species have negative impacts on both the ecosystem and the humanity.

Ch. 5

Question 1

The two key contributions that the natural environment makes to our economies include the provision of natural resources, including biodiversity, and ecological support of our well-being. The specific processes that occur in the natural environment influence our economies and well-being positively due to the functioning of ecosystem services. In fact, environmental benefits are numerous for humans. We serve as the users of natural resources, but at the same time we serve as extractors and protectors of the natural environment. Hence, natural environment can be valued by humans in economic terms.

Question 3

The major causes for the transitions in U.S. history from one type of environmental policy to another include environmental problems, political processes and technological innovations. Peering into the future, it becomes clear that life and society might be different in 25, 50, or 100 years because of the changes in the environmental policy. I would predict that the environmental policy of the future could be improved significantly due to the changes in human minds or environmental consciousness. It might address the issues like global warming, pollution and other environmental issues. I can predict that we will have more environmental policy because of radical changes in the ways to solve particular issues. 

Ch. 6

Question 1

The approximate current human global population is 7.4 billion. Approximately 200,000 people are being added to the population each day.

 Question 10

Poorer societies have higher population growth rates than wealthier societies for a number of reasons. First of all, poorer societies have no opportunity to use contraceptives as health care services are limited. Secondly, poorer societies are against abortion based on their strict religious beliefs. Thirdly, poorer societies lack educational opportunities to change their philosophy of life. Actually, poverty affects the environment. Environmental degradation causes exacerbation of poverty, having adverse impact on human health and leads to unsustainable use of natural resources. Ecological problems are produced by a number of environmental factors, such as the lack of the proper soil, drinking water, increased draught, deforestation, erosion, etc. Affluence affects the environment in a positive way. Wealthy societies can help to save the environment using new technologies. In other words wealthy societies have the proper financial means to make investments in technological research aimed at reduction of pollution. At the same time, the lifestyle of wealthy societies requires unnecessary depletion of natural resources because of the economic needs.

Works Cited

Withgott, Jay & Laposata, Matthew. Essential Environment, 5th Edition. Pearson Publisher.

The terms offer and acceptance. (2016, May 17). Retrieved from

[Accessed: November 26, 2021]

"The terms offer and acceptance." freeessays.club, 17 May 2016.

[Accessed: November 26, 2021]

freeessays.club (2016) The terms offer and acceptance [Online].
Available at:

[Accessed: November 26, 2021]

"The terms offer and acceptance." freeessays.club, 17 May 2016

[Accessed: November 26, 2021]

"The terms offer and acceptance." freeessays.club, 17 May 2016

[Accessed: November 26, 2021]

"The terms offer and acceptance." freeessays.club, 17 May 2016

[Accessed: November 26, 2021]

"The terms offer and acceptance." freeessays.club, 17 May 2016

[Accessed: November 26, 2021]
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