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| 1. Once a dam is constructed, electricity can be produced at a constant rate. 2. If electricity is not needed, the sluice gates can be shut, stopping electricity generation. The water can be saved for use another time when electricity demand is high. 3. Dams are designed to last many decades and so can contribute to the generation of electricity for many years / decades. 4. The lake that forms behind the dam can be used for water sports and leisure / pleasure activities. Often large dams become tourist attractions in their own right. 5. The lake's water can be used for irrigation purposes. 6. The build up of water in the lake means that energy can be stored until needed, when the water is released to produce electricity. 7. When in use, electricity produced by dam systems do not produce green house gases. They do not pollute the atmosphere. | |
1. Dams are extremely expensive to build and must be built to a very high standard.
2. The high cost of dam construction means that they must operate for many decades to become profitable.
3. The flooding of large areas of land means that the natural environment is destroyed.
4. People living in villages and towns that are in the valley to be flooded, must move out. This means that they lose their farms and businesses. In some countries, people are forcibly removed so that hydro-power schemes can go ahead.
5. The building of large dams can cause serious geological damage. For example, the building of the Hoover Dam in the USA triggered a number of earth quakes and has depressed the earth’s surface at its location.
6. Although modern planning and design of dams is good, in the past old dams have been known to be breached (the dam gives under the weight of water in the lake). This has led to deaths and flooding.
7. Dams built blocking the progress of a river in one country usually means that the water supply from the same river in the following country is out of their control. This can lead to serious problems between neighbouring countries.
8. Building a large dam alters the natural water table level. For example, the building of the Aswan Dam in Egypt has altered the level of the water table. This is slowly leading to damage of many of its ancient monuments as salts and destructive minerals are deposited in the stone work from ‘rising damp’ caused by the changing water table level.
A watershed is the area of land where all of the water that is under it or drains off of it goes into the same place. John Wesley Powell, scientist geographer, put it best when he said that a watershed is:
"that area of land, a bounded hydrologic system, within which all living things are inextricably linked by their common water course and where, as humans settled, simple logic demanded that they become part of a community."
Deforestation and excess Carbon dioxide (CO2) are problems which are impacting the world around us and the world we are giving to our children and their children. CO2 is a naturally occurring gas. However, increased human use of fossil fuels has dramatically raised the level of CO2 in our atmosphere and carbon pollution is negatively affecting present and future generations. Damages from climate change are expected to exceed one trillion dollars if not adequately addressed, and Nobel Prize-winning Intergovernmental Panel on Climate Change (IPCC) scientists estimate that one-third of all species are at risk. Without intervention, weather is predicted to become more extreme, oceans may become more acidic and crop growth may be negatively impacted. That means we should ACT NOW to ensure a safer future.
What can we do to reduce this problem? Protect, Preserve and Plant more trees. Forests serve as a buffer between the atmosphere and us. Carbon pollution is released into the atmosphere from our use of fossil fuels and other activities, while trees absorb CO2. By expanding our forests and increasing the quantity and quality of trees in our forests, we can increase the amount of CO2 absorbed from our atmosphere, reducing carbon pollution and climate change.
About global warming and greenhouse gases
The Angel of History, the Storm of Progress, And the Order of the Soul
Keith Helmuth
Lyrics and commentaries about the writing of the song
Definition of Cortege
what kind of currency grows in these new deserts
thinning ozone
What is a Green Brain?
Deforestation started because people began living in wooded areas. People cut down forests for houses, farms, and even for wood needed for big cities. Thousands of forests covered the earth many years ago. But, because of these reasons, only a few of the original forests remain to this day.
The earth’s population is increasing every second. Therefore, there is a need for more wood for houses, businesses and also for firewood. People clear the land to make room for new buildings. Deforestation mostly occurred in the 20th century. Today, only 30 % of the Rain Forests remain. Believe it or not, 10,000 years ago half of the world's land mass was covered with Rainforest.
Video on economic systems and deforestation
Forests has more than just a Range of values
Benefits of the Ecosystem services provided by food, fuel wood and regulating carbon in the atmosphere stabilizing the global climate. South cocases. habitat for wildlife and protection of top soil for agriculture.
Armenia
Provide clean water,recreational use, protection from flooding
Protect our watershed
unsustainable logging
what is a forest worth slide
exploitation
goods and services we use are not bought and sold
reliable sources of clean water
hydro power
Watershed in the Catskills for NYC
redefine economic systems
relationship with nature
National wealth
Threat from slash and burn
farms and ranches
abandoned
wildlife
hydro power/floods
human tribes
creates poor soil and decreases production
rich businesses profits
Extinction
plants that cure diseases disappear
Impacts of global warming on the economy
21 items | 14 visits
All of these are for my Economics Music Project
Updated on Nov 18, 11
Created on Nov 10, 11
Category: Schools & Education
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