the a-z of global warming: deforestation - carbon dioxide absorbent
Deforestation is basically the loss or destruction of forest habitat, mainly the result of human action.
It's the largest single land source.
Use greenhouse gas emissions, accounting for about 18-
20% of global greenhouse gas emissions.
We learned from a previous article that trees and vegetation are sinks or reservoirs of carbon dioxide (one of the most important greenhouse gases.
Through decades of growth, stored carbon removed from the atmosphere by photosynthesis is released back into the atmosphere as vegetation and trees are cut and burned, or as unburned organic matter slowly dies.
This process contributes to atmospheric CO2 levels.
Food and Agriculture Organization of the United Nations (FAO)
Who is the main source of information on the state of forests in the world and who defines the forest as "land with a canopy of more than 10% and an area of more than half a hectare ".
The organization defines deforestation as "converting forests into another land use or reducing tree canopy cover to a minimum threshold of 10% for a long time.
"Land change and carbon dioxide.
Land use change is almost entirely driven by emissions from deforestation, which is highly concentrated in a few countries.
Indonesia contributed about 30% of its carbon dioxide emissions from land use, and Brazil contributed about 20%.
It is estimated that about 80,000 acres or 32,000 hectares per day are disappearing.
This is equivalent to about 117,000 square kilometers ,(45,173 square miles)each year.
At present, the total area of the world rainforest is about 6 million square kilometers.
2,316,602 square miles)
Equivalent to 5% of the Earth's land surface.
Just thousands of years ago, the rainforest covered about 12% of the world's land surface, about 15. 5 million square kilometers ,(
6 million square miles).
A quick calculation shows that if forest coverage falls at a rate of 117,000 square kilometers per year, it will take only 51 years for the rainforest in the world to be destroyed! (
6,000,000 divided by 117,000).
The destruction at this level will lead to the release of a large amount of carbon dioxide into the atmosphere, and the carbon dioxide "blanket" around our planet is further thicker, which will undoubtedly lead to warming of the atmosphere.
2000 2006 Brazil loss the nearly 150,000 km2 ,(57,915 square miles)
The area is equivalent to the forest area of Greece, more than 600,000 square kilometers since 1970 ,(
231,660 square miles)
It's been destroyed.
It is estimated that Amazon has now been destroyed by nearly 20%, which is quite shocking when people think that Amazon rainforest accounts for 50% of the world's rainforest.
There are various reasons for deforestation, including cattle raising, farmers' activities, fires, mining and road construction, and of course logging and commercial agriculture.
However, it is not entirely fair to attribute all deforestation to developing countries.
While countries like Brazil and Indonesia may now be the main culprit, until the beginning of the 20 th century, the carbon dioxide emitted through land use change came from developed countries.
Clearing forests is a natural step for developing countries
Agricultural and residential land.
The fact is that since developed countries have cut down many areas long ago, developing countries are facing more pressure to protect the rest.
Of course, population growth is another major factor that will be discussed in later chapters.
Another important point is that trees in local forests hold about 50% more carbon per hectare than trees outside the tropics.
As a result, deforestation in these areas leads to more carbon dioxide release into the atmosphere than deforestation outside the tropics.
The future of the forest.
It is worth noting that when it comes to land use change emissions, countries such as the United States, Europe and China net absorbed carbon dioxide in 2000 due to afforestation (
Planting New Forest)
Rebuilding old forest areas)programs.
However, because trees absorb carbon dioxide very slowly, planting a tree does not offset the damage caused by removing another tree.
A growing tree may take 100 to restore all the carbon dioxide released when the mature tree is cut down! .
For this reason, it is highly worthless to suggest planting trees to offset the carbon offset plans for the carbon dioxide generated, as the tree takes time to remove carbon dioxide from the atmosphere.
However, there is also some good news that the Brazilian government announced a significant reduction in deforestation in 2006.
The loss for 2005/6 is 13,100 square kilometres ,(5,057 sq miles)
It was down more than 40% from the previous year.
It is too early to say whether this is a downward trend, or whether it has only been a good year in the past eight years, where deforestation has exceeded 16,000 square kilometers. (6,177 sq miles).
With the destruction of the world's forests, a large amount of carbon dioxide is released back into the atmosphere.
Forests that used to be able to absorb and store this strong greenhouse gas will no longer stand, which will push the level of carbon dioxide up, leading to global warming. Copyright (c)