En-en adult card 6 deforestation: Difference between revisions
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The area of forest lost each year is gradually shrinking. It has decreased from 7.8 million hectares lost per year in the 1990s to 4.7 million hectares in 2010. This is mainly due to the fact that forests are growing elsewhere, either naturally or artificially.<ref name="FAO 2020"/>. | The area of forest lost each year is gradually shrinking. It has decreased from 7.8 million hectares lost per year in the 1990s to 4.7 million hectares in 2010. This is mainly due to the fact that forests are growing elsewhere, either naturally or artificially.<ref name="FAO 2020"/>. | ||
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Revision as of 12:16, 7 February 2021
Card #6: Deforestation
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Deforestation consists in cutting or burning trees beyond the ability to restore the forest.
80% of the deforestation is related to agriculture.
Definition
Deforestation, clearance, clearcutting or clearing is the removal of a forest or stand of trees from land which is then converted to a non-forest use.[3] Deforestation can involve conversion of forest land to farms, ranches, or urban use.[1]
Explanation
Deforestation can be seen as a human activity or as a consequence of agriculture, or both. However, the main issue with deforestation is not that it destroys carbon sinks: it's that it emits CO2 hat took decades or centuries to capture. It's a difference between flow and stock.
Facilitation tips
The consequences of this card and of Other GHGs card are very forgotten, because participants often focus only on the consequences of Fossil Fuels. It is important to make sure that participants also consider the consequences of this card.
Other possible links
Causes
- Industry This link is possible for wood-consuming industries. However, wood used by a factory from a sustainably managed forest is not considered deforestation.
- Transportation Road construction sometimes requires deforestation, but the one-dimensional aspect of the road makes it almost negligible compared to agriculture-related wide scale deforestation.
Consequences
- Carbon Sinks Participants often think that deforestation reduces carbon sinks. In reality, the impact is minimal because deforested areas represent a very small part of the total forest area. Moreover, a mature forest is in equilibrium and no longer absorbs carbon. Therefore, as mainly mature forests are deforested, this does not impact carbon sinks. On the other hand, the CO2 released is very important, equivalent .
- Radiative forcing When forests are cut down, a dark green surface is replaced by a light green one, which has a higher albedo and therefore absorbs less energy.
- Disruption of the Water Cycle or River Flooding Vegetation retains water. If cut down, it makes flooding easier.
- Forest Fires Part of the deforestation is done by burning down forests: that can run out of control. This is what happened in summer of 2019 in the Amazon forest and in Australia
- Terrestrial Biodiversity Deforestation causes huge losses of biodiversity :
Additional content
Wood usage
93% of the wood from deforestation is burned (paper, agriculture, disposable furniture ......) and only 7% is used in a sustainable way (lasting furniture, construction ...).
Distribution of causes of deforestation
The factors of deforestation[3] are:
- 40% for commercial agriculture: livestock breeding, soya or oil palm cultivation
- 33% for local subsistence farming
- 10% for urban expansion
- 10% for infrastructure expansion
- 7% for mining.
These numbers are global averages, and vary greatly from country to country..
Speed of forest loss
The area of forest lost each year is gradually shrinking. It has decreased from 7.8 million hectares lost per year in the 1990s to 4.7 million hectares in 2010. This is mainly due to the fact that forests are growing elsewhere, either naturally or artificially.[2].