Drought And Desertification Climate Change Pdf

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drought and desertification climate change pdf

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One of the impacts which global warming may have on the surface of the Earth is to exacerbate the world-wide problem of desertification. A decrease in the total amount of precipitation in arid and semi-arid areas could increase the total area of drylands world-wide, and thus the total amount of land potentially at risk from desertification. In addition, desertification may enhance regional warming, through a variety of climate feedbacks. Desertification has been defined by the United Nations Conference on Environment and Development Rio de Janeiro, as "land degradation in arid, semi-arid and dry sub-humid areas resulting from various factors including climatic variations and human activities". Desertification involves the depletion of vegetation and soils.

The economics of desertification, land degradation, and drought

Metrics details. Worldwide, the arid regions have been experiencing cyclical droughts and devastation due to land desertification. A multi-criteria approach was proposed to establish the relationship between these pressures and assess their impact on the socio-economical, physical, and biological resources. This method was applied at local scale in the palm grove of Draa valley in southeastern Morocco. This paper aims to assess the socio-ecological impacts of drought and desertification, to develop a set of impact indicators of each phenomenon, and explore the relationship between drought and desertification. A framework of analysis was developed based on data collected from a survey using samples of questionnaires: for desertification and for drought. The results depict that drought is considered a first-rate threat in this region.

News, analysis, experiments, videos, games, and educational paths on the issues of energy and the environment for complete and topical information. Due to the extent of damages and the number of people involved, drought is the number one natural catastrophe. A dry period is marked by less frequent precipitations compared to the annual average of the area. Dry periods have become more frequent and more intense over the last few decades, involving almost all of the emerged areas. This tendency to drought has not only affected the dry or half-dry areas of Africa and Asia, that have been the most seriously affected by the different dry spells of the last 30 years, but also the mild and northern countries.

Drought in the Sahel

A drought is an event of prolonged shortages in the water supply, whether atmospheric below-average precipitation , surface water or ground water. A drought can last for months or years, or may be declared after as few as 15 days. Periods of heat can significantly worsen drought conditions by hastening evaporation of water vapour. Drought is a recurring feature of the climate in most parts of the world. However, these regular droughts have become more extreme and more unpredictable due to climate change. In fact studies based on dendrochronology , or tree rings dating, confirm that drought affected by global warming goes back to

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Dryland areas in Africa are under threat from deforestation, soil erosion, nutrient mining, recurrent drought and climate change, potentially result- ing in land.


The economics of desertification, land degradation, and drought

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5 Comments

  1. Antilahun 19.05.2021 at 08:57

    Attention to land degradation and environmental pollution has increased significantly in the past 25 years, largely due to greater levels of international cooperation and recognition that local changes in land resources have global impacts.

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  3. Bailey L. 23.05.2021 at 02:13

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  4. Jataridi 25.05.2021 at 06:45

    Desertification is a type of land degradation in drylands in which biological productivity is lost due to natural processes or induced by human activities whereby fertile areas become increasingly arid.

  5. Leon E. 26.05.2021 at 21:32

    The Sahel region of West Africa is well known as a region of environmental degradation.