For climate
change, people always solve the problem of replacing fossil fuels with
renewable energy, but fossil fuels, are not the only factor that is causing climate change. Desertification, referring
to land turn into desert, is another major cause of climate change. When the
soli is damaged and bare, it can evaporate water and give off methane to the
atmosphere, just as the results of burning fossil fuels. Almost two thirds of
our world land has potential to desertification during months of dryness. People
always believe that the major cause of desertification is livestock by
overgrazing the plants. The only way to allow new plants to grow is by fire in
order to decrease desertification. However, in the TED talk by Allan Savory, he
showed us an unthinkable method. He pointed out that reduce animal numbers and
burn grass will both lead to desertification and climate change. The only one
option is to stop desertification is to use livestock. The planning process is
called holistic management and planned grazing, which develop strategies for
planning livestock to mimic nature in order to heal the land. Savory argues
that the land tramped gently by livestock can store carbon and break down
methane, retaining the ability to mediate relieve climate change. He encourages
people to add more cattle to deserts and sell and eat more meat.
I think the basic
principle of holistic management sound pretty reasonable at first. However, many
factors need to be taken into account in order for successful work in practice.
First of all, nature’s complexity is hard to predict and there are diversity in
the bare ground and grassland. Many different factors such as plant types,
heights of vegetation are necessary to lead to a perfect symbiosis between
plants and livestock. When asked about what the animals ate after they added to
the desert, Savory explained there was no need for feeding just depending on
movement according to the sigmoid curve. However, some studies show that no
grazing method can overcome overgrazing during long term. Cattle will get tired
and need supplementary food source. The study in eastern Karoo (http://www.sciencedirect.com/science/article/pii/S0140196303001071) showed that
intensive grazing actually decrease grassland cover and reduce the total
biomass there.
Secondly, holistic
management only work in a narrow set of conditions and it cannot be applied to
larger spatial scales. This method is not useful the desert land type in
country such as Russia, eastern Africa, etc, because not all land types are
suitable for constantly moving by large herds. Some land in dry years can lead
to far more degradation by livestock. In addition, not all bare lands are bad
since there are many species depending on the bare land for evolving.
Thirdly, nature’s complexity
is hard to mimic. Savory used the term “mimic” several times in his speech, but
this word is easier said than done. Desert or bare land has many co-evolved
organisms that are lived symbiosis for over millennia, human-managed “mimicking
nature” cannot become a perfect representative of the real nature’s complexity.
Overall, I think Allan
Savory’s method need to evolve and improve by adding more environmental factors
into account when treating different types of desert land. In addition, his
method is right when several conditions are met, such as high rainfall and
frequently movement of cattle. Thus, people need to precisely evaluate
environmental conditions in different desert land and find out eligible land
that are suitable for holistic management.
Sources:
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Such a nice blog with useful information. I would be thankful if you share more information about livestock Agricultural scales .
ReplyDeletelivestock Agricultural scales