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

Natural BANK. Do u get the roll?

As in an economic system scheme, capital is related to all the valuable and useful resources that an entity (private company, NGO, and rollin') could have. The main purpose of an economic system is to produce and distribute (for an later consumption) of goods and services by the use of human and manufactured resources to satisfy people's needs and wants.

In contrast we have the NATURAL SYSTEMS, which have their own form of capital. NATURAL CAPITAL is as valuable than "economic capital". It gather all of the means needed to accomplish all of the ends. NATURAL CAPITAL includes

• the natural resources that have value and those that support life
• the natural processes that take place.

As in the economic system, NATURAL CAPITAL is also intend to produce an income.

e.x.

Photosyntesis ------------------------------> oxygen

water cycle -----------------------------> fresh water

nitrogen cycle -------------------------------> nutrients in the soil

biodiversity --------------------------------> stability, evolution, and rollin'

Natural capital might be classified in:

- renewable - replenishable

- non-renewable - recyclable