You have new items in your feed. Click to view.
Question and answer
Explain why biodiversity is important for the survival of species, including humans. How could the destruction of the rainforest, and its biodiversity, affect people living in the United States?
Rainforests now occupy less then ½ of the land that they did 100 years ago (that’s less than 2% of the earth’s surface). The major causes of biodiversity decline are land use changes, pollution, changes in atmospheric CO2 concentrations, [ changes in the nitrogen cycle and acid rain, climate alterations, and the introduction of exotic species, all coincident to human population growth. For
rainforests, the primary factor is land conversion. Climate will probably change least in tropical regions, and nitrogen problems are not as important because growth in rainforests is usually limited more by low phosphorus levels than by nitrogen insufficiency. The introduction of exotic species is also less of a problem than in temperate areas because there is so much diversity in tropical forests that newcomers have difficulty becoming established (Sala, et al., 2000). a. Human population growth: The geometric rise in human population levels during the twentieth century is the fundamental cause of the loss of biodiversity. It exacerbates every other factor having an impact on rainforests (not to mention other ecosystems). It has led to an unceasing search for more arable land for food production and livestock grazing, and for wood for fuel, construction, and energy. Previously undisturbed areas (which may or may not be suitable for the purposes to which they are constrained) are being transformed into agricultural or pasture land, stripped of wood, or mined for resources to support the energy needs of an ever-growing human population. Humans also tend to settle in areas of high biodiversity, which often have relatively rich soils and other attractions for human activities. This leads to great threats to biodiversity, especially since many of these areas have numerous endemic species. Balmford, et al., (2001) have demonstrated that human population size in a given tropical area correlates with the number of endangered species, and that this pattern holds for every taxonomic group. Most of the other effects mentioned below are either consequent to the human population expansion or related to it. The human population was approximately 600,000 million in 1700, and one billion in 1800. ]
Expert answered|lgcn|Points 1353|
Question
Asked 2/14/2013 7:18:36 PM
0 Answers/Comments
Get an answer
New answers
Rating

There are no new answers.

Comments

There are no comments.

Add an answer or comment
Log in or sign up first.
0 questions answered
Popular Conversations
Expressed powers are
Weegy: Strict Constructionist User: People who are against capital punishment argue that it violates the
9/25/2016 9:43:37 PM| 2 Answers
IAB stands for
Weegy: what can i help you?
9/25/2016 12:21:25 AM| 1 Answers
What is a monopoly?
9/25/2016 1:58:33 AM| 1 Answers
Weegy Stuff
S
L
P
P
P
P
P
L
Points 939 [Total 5011] Ratings 2 Comments 919 Invitations 0 Offline
S
P
1
L
Points 663 [Total 1543] Ratings 5 Comments 613 Invitations 0 Offline
S
Points 205 [Total 499] Ratings 0 Comments 205 Invitations 0 Offline
S
Points 105 [Total 105] Ratings 0 Comments 105 Invitations 0 Offline
S
L
P
Points 97 [Total 1209] Ratings 0 Comments 97 Invitations 0 Offline
S
Points 72 [Total 72] Ratings 0 Comments 72 Invitations 0 Offline
S
Points 30 [Total 30] Ratings 3 Comments 0 Invitations 0 Offline
S
L
Points 25 [Total 4250] Ratings 1 Comments 15 Invitations 0 Offline
S
L
P
P
P
Points 13 [Total 3875] Ratings 0 Comments 13 Invitations 0 Offline
S
Points 10 [Total 10] Ratings 1 Comments 0 Invitations 0 Offline
* Excludes moderators and previous
winners (Include)
Home | Contact | Blog | About | Terms | Privacy | © Purple Inc.