Desertification: What It Means荒漠化的后果

Desertification is a silent， invisible， and slow-burn crisis that is currently destabilizing livelihoods and communities in over 100 countries. Much like climate change， the impacts of desertification are felt first-hand in specific belts of the world. That said， the rest of the world isn’t at all immune to the risks， especially second-hand impacts such as social destabilization， migration， food security， and water scarcity.

In an age characterized mainly by biting off more than we can chew on several fronts， the pace of desertification has increased nearly 35 times the historical speed.

What is desertification？

The word itself might bring to mind wind-swept sandy dunes， but， in reality， desertification is a natural phenomenon aggravated to the point that it severely threatens the lives and livelihood of 200 million people worldwide.

Desertification is the process by which fertile land becomes a desert due to natural or human-made causes. The process is natural， but the human causes of desertification have vastly outpaced its natural speed. This decline in biological productivity happens due to a variety of causes， including：

Deforestation

Overgrazing

Climate change

Unsustainable agriculture

Irresponsible irrigation

Flooding and topsoil erosion

Soil pollution

Political and social instability

Desertification not only degrades land in arid and sub-humid areas; it also destroys dryland ecosystems that already exist in deserts， shrublands， and drylands. The rapid global urbanization and land reclamation only serve to aggravate both causes and effects of desertification. Worse， it leaves us with much less land to use for growing food， which—in a world where 95% of nutritious food comes from healthy soil—is a dangerous situation to be in.

The risks of desertification

Pressures on food production systems

Worldwide desertification will have catastrophic effects on food and agricultural systems. As more and more lands become infertile and unavailable for agriculture， the pressures to produce food faster and in higher volumes will increase. Overexploitation of existing lands is a given due to a lack of choice; there will likely also be a spike in the use of chemicals， which will bring down the quality of food produced.

Accelerated deforestation

While deforestation is one of the significant causes of desertification， it is also exacerbated by the process it causes. When lands that were traditionally viable for agriculture decrease in usability， forests， and natural ecosystems will be encroached into. Hectares of forests will be torn down to make space for agricultural land.

Increased social conflicts

In drought-prone and naturally dry areas of the world， desertification has the potential to wreak havoc on the peace and stability of nations. Battles over land and resources will blow up into full-scale wars， much like what is already happening in parts of Asia and Africa that are most vulnerable to the risks of desertification and climate change. Drought and land degradation can trigger a crisis that is then exacerbated by uneven food distribution， lack of access to what is available， and existing poverty and strife.

Higher migration and social pressures

In a bid to move towards greener pastures literally and figuratively， thousands are displaced from their homes on the daily. This mass migration could be internal or international; either way， the envir-onmental and social structures in areas that these migrants choose to settle in can come under severe pressures. This further fans the flame of conflict， inequality， and unsustainable living conditions.

Wider risks to public health

Dropping rates of food security will increase the risks of starvation， malnutrition， and hunger for millions around the world. The rising heat from barren lands and higher temperatures will increase health hazards and infectious illnesses such as dengue and malaria. Unclean water and shortages will increase the chances of water-borne diseases such as cholera and dysentery. In short， desertification poses massive challenges to public health and has the potential to wreak havoc on unsuspecting healthcare systems.

Desertification and climate change

Climate change has the potential to exacerbate desertification， especially in areas that are already vulnerable to shifts in temperature， winds， and solar radiation. The link between the two is a two-way one in that both climate change and desertification pose risks to each other. Additionally， they also form a vicious cycle in that the impact of desertification increases the risks of climate change and vice versa. The relationship is complex， multi-layered， and still under study. However， the known connections between the two phenomena are as follows：

Dry climates mean lower recovery from droughts

Human-induced global warming has wreaked havoc on climatic zones such that dry climates have increased in number and intensity， as have traditionally polar climates. Unprecedented heat waves and drying water bodies overwhelm the vegetation’s ability to recover from droughts， which results in irreversible degradation and desertification.