Sustainable Yield in Deserts

Sustainability a wide spread term in the last decades. Economists, politicians, scientists and  businessmen are using it for everything. It is really a fashion nowadays. We must understand its real value and its real importance. A sustainable development is needed if we want to maintain the equilibrium of the world, respecting its carrying capacity. 
Sustainable yield is the the natural income that can be exploited each year without getting rid of the resources. Sustainable yield is different from one ecosystem to another. We’ll work with sustainable yield in deserts.
Specifications.
We must considered that resources in desert biomes are very scarce. The levels of precipitation are less than 15 cm a year. The diversity of desert’s flora is relatively low compared to other biomes. Contrary to the common belief the actual fauna of deserts is very rich and its concentrated in certain areas. The resources of deserts around the world differ from one and other. We can find oil and other fossil fuels in some deserts, minerals, and species richness.
In order to measure, and thus manage sustainable yield, we must establish space and time parameters. This will help us to know how much we have and how much we can use.
Useful indicators had been developed in order to maintain track of the advances in sustainable development. Some examples of this indicators can be found here, the Finland's sustainable development indicators:

• Human Development Index
• Greenhouse gas emissions
• Total energy consumption
• Use of renewable energy sources
• Energy and natural resource consumption in relation to economic growth
• Environmental loading in ration to economic growth

It is important to notice that not just because we are respecting the maximum sustainable yield (MSY) of a certain system, the resources will be endless. There are a lot of variations and factors that affect a system. A pretty good example of this is the chaotic situation of West Coast groundfish fishery in the United States, explained deeply here.
This is another thing in which indicators come handy and it’s the point where the management enters into the picture.
Links.
http://www.csgc.ucsd.edu/NEWSROOM/NEWSRELEASES/Carmel_Finley.html
http://www.ymparisto.fi/download.asp?contentid=92350&lan=en

Defining Sustainability

In simple words: sustainability is to endure. To exist for a long period of time. If you ask me, sustainability is “the responsible manage of resources that work towards using them while maintaining an equilibrium.”

Introduced in an actual context.
Sustainability is a term that has gained importance in the social world’s context because the arise of concern about the actual Eath’s natural capacity to sustain human life as it is know. That’s why the concept, in means of development, has been defined as: “sustainable development is development that meets the needs of the present without compromising the ability of future generations to meet their own needs.”

As a social issue, sustainability enters in means of maintaining the resources for future generation. We must understand that for the world natural equilibrium to be maintained, we need to start taking greater conscience about damage we are making to the environment and how we are wearing down its sustainability. That’s why society and specific institutions are working to create policies for the regulation of the human activities that act against sustainability.

In an economic context. The concept of sustainable yield enters into the picture. It is the increase of natural capital. The natural income that can be exploited each year without getting rid of it. MSY (maximum sustainable yield) is based on this last idea.

It’s equal to
-(The total biomass or energy at a time) T1 – (total biomass of energy at a time) T
-Annual growth and recruitment – annual death and emigration.

A few points to achieving a sustainable way of living:

• To control the exploitation of natural resources.
  
• To look for alternative practices that help prevent a loss of equilibrium.
  
• Understand the entire human society structure and the economic system as part of the global environmental system

Sustainability is involved in three different spheres. Each one of the spheres functions as an individual particle, but at the same time are affected by the others.