Sunday, September 7, 2008
the poster~~~~
last step
arrow A is used to type words...it is call as type tool (T)
arrow B is to fill the color inside the alphabet
arrow C is the color of the line for the alphabet
arrow D is type of font
arrow E is size of font
arrow F is align center...to make those alphabet in center..
for fill color the gradient is C : 3,14% M : 21,18%, Y : 45,49%, K : 0,39%
for stroke color the gradient is C : 25,53%, M : 38,43%, Y : 96,86%, K : 9,8%.
the font i used is ravie n the size is 72.
step 5
step 4
step 3
i color the human hand used live paint bucket (K) and the shadow of the human hand i used pencil tool (N) and the stroke weight for pencil tool is 4 pt...
the gradient for the human hand is
C : 27,45%, M : 40,39%, Y : 67,06%, K : 13,33%
and
the gradient for the shadow of the human hand is
C : 34,9%, M : 47,06%, Y : 68,24%, K : 23,53%.
step 2
i used pencil tool (N) to draw the leaf...There 3 type of green color that i used..i used 3 color to make the hand of leaves look real..and i color the leaves using live paint bucket (K)..the 3 type of green color is
1st one is - C : 46,1%, M : 2,75%, Y : 94,12%, K : 0,39%
2nd is - C : 54,9%, M : 1,96%, Y : 95,69%, K : 0%
3rd is - C : 58,82%, M : 1,96%, Y : 80,78%, K : 0%
i used pencil tool (N) also to draw the human hand and the gredient is
C : 34,9%, M : 47,06%, Y : 68,24%, K : 23,53%.
Monday, August 18, 2008
step 5
continue from step 4
step 4
step 3
step 2
Cause:
Deforestation has been practiced by humans since the beginnings of civilization. Fire was the first tool that allowed humans to modify the landscape. The first evidence of deforestation appears in the Mesolithic. It was probably used to drive game into more accessible areas. With the advent of agriculture, fire became the prime tool to clear land for crops. In Europe there is little solid evidence before 7000 BC. Mesolithic foragers used fire to create openings for red deer and wild boar. In Great Britain shade tolerant species such as oak and ash are replaced in the pollen record by hazels, brambles, grasses and nettles. Removal of the forests led to decreased transpiration resulting in the formation of upland peat bogs. Widespread decrease in elm pollen across Europe between 8400-8300 BC and 7200-7000 BC, starting in southern Europe and gradually moving north to Great Britain, may represent land clearing by fire at the onset of Neolithic agriculture.
Effect:
Atmospheric pollution
Deforestation is often cited as one of the major causes of the enhanced greenhouse effect. According to the Intergovernmental Panel on Climate Change deforestation, mainly in tropical areas, account for up to one-third of total anthropogenic carbon dioxide emissions.[14] Trees and other plants remove carbon (in the form of carbon dioxide) from the atmosphere during the process of photosynthesis. Both the decay and burning of wood releases much of this stored carbon back to the atmosphere. Deforestation also causes carbon stores held in soil to be released. Forests are stores of carbon and can be either sinks or sources depending upon environmental circumstances. Mature forests can be net sinks of carbon dioxide (see Carbon dioxide sink and Carbon cycle).
The water cycle is also affected by deforestation. Trees extract groundwater through their roots and release it into the atmosphere. When part of a forest is removed, the region cannot hold as much water and can result in a much drier climate.
Biodiversity
Some forests are rich in biological diversity. Deforestation can cause the destruction of the habitats that support this biological diversity, thus contributing to the ongoing Holocene extinction event. Numerous countries have developed Biodiversity Action Plans to limit clear cutting and slash and burn agricultural practices as deleterious to wildlife and vegetation, particularly when endangered species are present.
Water cycle and water resources
Trees, and plants in general, affect the water cycle significantly:
their canopies intercept a proportion of precipitation, which is then evaporated back to the atmosphere (canopy interception);
their litter, stems and trunks slow down surface runoff;
their roots create macropores - large conduits - in the soil that increase infiltration of water;
they contribute to terrestrial evaporation and reduce soil moisture via transpiration;
their litter and other organic residue change soil properties that affect the capacity of soil to store water.
As a result, the presence or absence of trees can change the quantity of water on the surface, in the soil or groundwater, or in the atmosphere. This in turn changes erosion rates and the availability of water for either ecosystem functions or human services.
The forest may have little impact on flooding in the case of large rainfall events, which overwhelm the storage capacity of forest soil if the soils are at or close to saturation.
Soil erosion
Undisturbed forest has very low rates of soil loss, approximately 2 metric tons per square kilometre (6 short tons per square mile).[citation needed] Deforestation generally increases rates of soil erosion, by increasing the amount of runoff and reducing the protection of the soil from tree litter. This can be an advantage in excessively leached tropical rain forest soils. Forestry operations themselves also increase erosion through the development of roads and the use of mechanized equipment.
China's Loess Plateau was cleared of forest millennia ago. Since then it has been eroding, creating dramatic incised valleys, and providing the sediment that gives the Yellow River its yellow color and that causes the flooding of the river in the lower reaches (hence the river's nickname 'China's sorrow').
Removal of trees does not always increase erosion rates. In certain regions of southwest US, shrubs and trees have been encroaching on grassland. The trees themselves enhance the loss of grass between tree canopies. The bare intercanopy areas become highly erodible. The US Forest Service, in Bandelier National Monument for example, is studying how to restore the former ecosystem, and reduce erosion, by removing the trees.
Landslides
Tree roots bind soil together, and if the soil is sufficiently shallow they act to keep the soil in place by also binding with underlying bedrock. Tree removal on steep slopes with shallow soil thus increases the risk of landslides, which can threaten people living nearby. However most deforestation only affects the trunks of trees, allowing for the roots to stay rooted, negating the landslide.
infomation from wikipedia : http://en.wikipedia.org/wiki/Deforestation#Atmospheric_pollution
Monday, July 21, 2008
meaning of this symbol.
the leaf of the tree i replace with love shape because it represent people who love nature. while the trunk shape is simplified of the real trunk of tree.
i choose the orange colour because is simplified the real colour of tree. Not just that, I used it because in definition of orange colour it said that orange is mentally stimulating as well as sociable. Use it to get people thinking or to get them talking. I want went people look at this symbol they will think the meaning of global warming or deforestation.
If you see closely there are 3 type of red colour. The reason why I use 3 types because not everyone have the same equal of love feeling toward nature. The more dark the colour the more love toward nature.
The reason I used 5 brunch from the trunk it refers to the elusive fifth element that completes the basic five elements (water, fire, air, source of sun, and earth). It means that if one of it unbalance it can effect others. If the nature is destroys because of deforestation it can cause other problem such as less of oxygen (for air element),and flood (for water element).
The relation of this symbol to area of global warming is about deforestation. This symbol represent save the nature to stop the global warming issue.
final step
step 3
step 1
my sketch
my research
HOW DOES IT HAPPEN?
* conversion of forests and woodlands to agricultural land to feed growing numbers of people;
* development of cash crops and cattle ranching, both of which earn money for tropical countries;
* commercial logging (which supplies the world market with woods such as meranti, teak, mahogany and ebony) destroys trees as well as opening up forests for agriculture;
* felling of trees for firewood and building material; the heavy lopping of foliage for fodder; and heavy browsing of saplings by domestic animals like goats.
CONSEQUENCES OF DEFORESTATION*
a) The carbon cycle. Forests act as a major carbon store because carbon dioxide (CO2) is taken up from the atmosphere and used to produce the carbohydrates, fats, and proteins that make up the tree. When forests are cleared, and the trees are either burnt or rot, this carbon is released as CO2. This leads to an increase in the atmospheric CO2 concentration. CO2 is the major contributor to the greenhouse effect. It is estimated that deforestation contributes one-third of all CO2 releases caused by people.
b) The water cycle. Trees draw ground water up through their roots and release it into the atmosphere (transpiration). In Amazonia over half of all the water circulating through the region's ecosystem remains within the plants. With removal of part of the forest, the region cannot hold as much water. The effect of this could be a drier climate.
* Soil erosion With the loss of a protective cover of vegetation more soil is lost.
* Silting of water courses, lakes and dams This occurs as a result of soil erosion.
* Extinction of species which depend on the forest for survival. Forests contain more than half of all species on our planet - as the habitat of these species is destroyed, so the number of species declines (see Enviro Facts "Biodiversity").
* Desertification The causes of desertification are complex, but deforestation is one of the contributing factors (see Enviro Facts "Desertification")
DID YOU KNOW?*
* An area of forest equal to 20 football or rugby fields is lost every minute.
* South Africa's climate is such that less than 0,5% of its surface area is covered with indigenous forest - great care should be taken to conserve the little we have.