35 Sustainable Environmental Performance
To end our discussion of specific macro-economic field theory we take a look at the environmental performance of economies. Although such statements are not a standard option of macroeconomic forecasts. However, it is due to the fact that the total population of men with soon 8 billion inhabitants on our planet and thus the limits of ecological carrying capacity of the planet has been reached, appropriate for simulations of the global economy is at least to bring a blanket and approximate consideration of sustainability in.
The prosperity of an economy is based in
principle on the average available goods and services, mostly national GDP, for
the averga citizen of the society. All these products
require raw materials and energy to their deployment. The immediate resource
commodities, energy and labor is
offset by the indirect resource equity. Capital is not a direct source of
wealth, but to distribute it and to give to the economics cooperators.
Money is a technical product and thus a distribution key, a metaressource
to the generation and and provision of welfare. But
the causal source of all wealth is always the environment. This has as its underlying
authority to pay the ultimate price for prosperity. Therefore, the human race benefitting from the environment has to ensure that this
main ressource of prosperity must not been ruined. For
this we make the following simplified balance sheet accounts, without entering
into all the complex details of the many biospheric
interactions we must. The terrestrial environment we call here
. It provides
energy and raw materials available:
(35.1)
In this case it is the total content of the
bound energy
of the earth and
the total content
of raw materials.
In addition to the time energy flows in from the outside, that is the energy of
the sun made available
as incident
energy. This is generally an effect of the Solar constant
(35.2)
This is the average per square meter incident
energy that can be used not only in solar collectors. It is stored in plant growth,
and so on geologically long time, such as in gas and oil. But also the dynamics
of the water and the use of water power capability is a direct effect of solar
energy. Eventual storage in plants and in the thermal energy of air and water
we will call short
, because this results in the natural growth, including the
so-called renewable resources. The raw material consists of both the
balance sheet of the geological past of the earthalready existing resources. These are contrary to the internal
consumption
, but can be
reduced through recycling activities
in
order to reverse. The overall balance should be positive as possible, ie the temporal change of (34.1) as greater than or equal
to zero:
(35.3)
The constantsandderived from the
geological past ar constants that fall away in the
differentiation and there will remain only the variable sizes:
(35.4)
Next we can change the equation by bringing the natural and economic resources to opposing sides
(35.6)
with
and 
(35.7)
with the sum of consumption and recycling
capabilities
of the i world economies. Carrying
out the differentiation on the right brings:
The last approximation results from the fact
that the values of the coefficients change
with
time is small, in any case less than the rates of change
of the GDP's. So we finally arrive at the inequality
(35.8)
The coefficient
of
the global environmental sustainability consumption should be possible less
than 1, or should be held at least only slightly above 1, to be sustainable. Otherwise
the global economy cuts their most important resource beyond the medium to long
term itself. The individual components are to be calculated in energy
equivalents for a single economy, and i describes the national sustainability coefficient
(35.9)
as the proportionate effect of the nation i. Conversely, an economy
is sustainable if their percentage growth
does
not exceed the maximum sustainable growth
:
(35.10)
The determination of the individual components is not easy, especially since some variables are mutually dependent.