Total
Material Requirement
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Consumption
and Production Patterns
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1. Indicator
(a)
Name: Total
Material Requirement (TMR)
(b)
Brief Definition: Total
Material Requirement is a compound indicator reflecting all of the
physical
materials that are mobilized each year to support an economy, including
“hidden”, non-economic materials such as mineral overburden,
processing waste and soil erosion. The TMR includes an aggregate
indicator and disaggregated sub-indicators by resource sector.
(c)
Unit
of Measurement: Metric
tonnes per year
(d)
Placement
in the CSD Indicator Set:
The indicator is part of the set of indicators of consumption and
production patterns. It is
not included in the general CSD indicator set.
2.
Policy Relevance
(a)
Purpose: This
compound indicator measures the total materials mobilized to support an
economy. It can be used to
analyze material efficiency and physical environmental disruption.
(b) Relevance to
Sustainable/Unsustainable Development: A
measure of the material required to support an economy is useful,
especially if measured regularly and consistently over time to identify
trends in material intensity. The indicator should be combined with
economic measures (e.g. TMR per unit GDP) to track changes in material
intensity and thus tendencies toward dematerialization of an economy (or
the reverse). TMR per unit
GDP would also provide a
tool to compare a country’s material economy with those of other
countries for a greater understanding of common as well as unique
patterns. Measurement of level and trends in material requirements would
allow better identification both of priorities for policy intervention
as well as points of leverage for that intervention. Measurement of total material flows requires the creation of a
set of physical accounts that illuminate activities that impact the
environment, their relative sizes, and leakages (such as pollution or
toxins embodied in products or emitted in processes that might otherwise
be unaccounted for). These
physical accounts could also be part of a set of Agreen
national accounts.@
(c)
International Conventions and Agreements: None.
The OECD is in the process of establish an informal Forum, where
interested countries may exchanged information on definitions,
methodologies and data issues, in order to facilitate the development of
national physical accounts.
(d)
International
Targets / Recommended Standards: There
are no known international targets. Some non-governmental organizations have recommended a target of
a factor of ten reduction in the material intensity of industrialized
economies, which would demonstrate an increase in eco-efficiency, as
expressed by such measures as TMR per unit GDP and ensure sufficient
resources for the material needs of developing countries and movement
toward a cleaner environment for all. Some European countries have established long-term national
targets for energy and material efficiency, together with indicators for
measuring progress, which is likely to stimulate demand for the
collection of material flow statistics.
(e) Linkages to Other
Indicators: This
indicator is linked to other physical indicators dealing with pollution,
land use, water use, and national financial indicators.
3.
Methodological Description
(a) Underlying Definitions and Concepts:
The
Total Material Requirement is as comprehensive as possible in accounting
for all physical material flows that support national economies,
excluding only air, water, and agricultural tillage. Flows include those
from mining (including overburden and gangue), construction (including
earth moving), agriculture (including crop residues), forestry
(including ancillary clearing and residues), soil erosion, energy,
manufacturing and every other sector that requires the mobilization of
materials from the environment for its operation. For purposes of this
macro indicator of national behavior, truly minor flows can be excluded
(e.g. diamond collecting in the United States) although nationally
important flows must be included -- even if of trivial importance in
many other countries (e.g., from gold mining.).
In addition
to an aggregate TMR, the indicator should be disaggregated into
components corresponding to broad sectors of activity: fossil fuels,
metals, other minerals, construction, infrastructure, renewable
resources and semi-manufactures. In each of these areas, total material
flows should be disaggregated into economic commodities and non-economic
hidden flows.
In
principle, flows are only counted once during a given year -- even if
during that year the materials are shifted about several times. While dredging and excavation are covered
-- whether used for extraction of raw materials, infrastructure
development, or construction -- each country will be confronted with
unique data and modeling problems in estimating these flows. Dredging in the United States, for example, is well documented,
in Germany less so.
In
principle, imported raw materials are included, with the data on their
mass and on the mass of the associated hidden flows included in the TMR
for the importing country, even for hidden flows that remained in the
country of origin. The
indirect material flows associated with those imports (e.g., energy
expended, metal in earth moving machinery) are not included. Imports of metals pose especially difficult problems since they
may be imported as crude ore, several grades of concentrated ores, or as
refined metal. In the
latter case, a certain proportion (currently undocumented and therefore
unknown) might be recycled, with much lower hidden flows than primary
metal. Each important metal
may need to be treated differently. However, as more countries develop
sets of national physical accounts, the inclusion of hidden flows
associated with imported materials in the accounts of the importing
country could lead to double counting, if those flows are also counted
in the physical accounts of the exporting country. Development of the
TMR indicator for any country should take this into account when drawing
system boundaries. Flows
from renewable resources are, in principle, treated similarly to those
from non-renewable sources. The
primary hidden flow associated with agricultural and forestry
activities, soil erosion, is categorized separately. Otherwise, hidden
flows are not distinguished or disaggregated from commodities. Material flows from agricultural and forestry should include the
dry weight of all major crops and their associated non-salable
above-ground harvested biomass. Thus,
a tree, for example, is counted as the mass of roundwood, and the
associated limbs, leaves, and stumpage. Livestock, fish, and other animal biomass are counted only if
they are fed from non-agricultural feeds. Thus fish harvested from wild stock are counted -- fish raised in
aquaculture are not. Livestock
produced primarily from grazing are counted, those raised on grain are
not.
Domestic
semi-manufactures, such as Portland cement, are not counted, although
the minerals used to make them are. . Foreign semi-manufactures, such as Portland cement, are counted
as imported along with the rucksacks associated with them. Foreign finished goods are counted alone (primarily due to lack
of data on the materials embodied in those goods and their associated
rucksacks.
Recycled
materials (e.g. scrap metal and paper) are counted as finished goods if
imported but not counted if domestically produced. Data on foreign imports are usually available as the value of the
import, defined by standard industrial codes (SIC), and are difficult to
convert to physical quantities of materials.
Exports
were not deducted. Materials
that were ultimately exported were, nonetheless essential to the support
of the economy and were, therefore, as much a basis for an industrial
economy as purely domestic flows. It should be noted that the inclusion
of imported goods together with their associated hidden flows in the
country of origin, and the non-deduction of exports and their hidden
flows, results in some double counting on the international level.
International aggregates of TMR will therefore overstate total material
flows.
(b)
Measurement Methods:
B Sources of data for
calculating TMR vary considerably from country to country. Sources for imported goods include financial data on trade and
tonnes landed at ports. Sources
for minerals and energy can often be obtained from Ministries, industry
organizations, and even individual companies and academic literature.
It is
inevitable that estimates based on expert opinion, economic costs, and
industry practice will be used until the statistical infrastructure
exists to provide better measures of the physical mass of materials
mobilized to support the economy.
B Hidden flows in particular
usually require indirect methods for their estimation. Overburden from mining might be modeled based on an average mine
or from information on costs or area impacted. Gangue can be estimated from the average
Agrade@
of ore from a country=s
mines, or from some illustrative example.
B Time series require, as much
as possible, common definitions and data collection methods. Often definitions subtly change over time or the time series
changes from estimated to measured.
(c) Limitations of the
Indicator: The
Total Material Requirement is not a measure of the impact of economic
activity on the environment. Measuring
all materials in mass units gives them all equal weight. Yet dredging might have an important local environmental impact
and would be important in an analysis of the local impact of material
flows. The burning of coal
might have an important global environmental impact and would be
important in any analysis of the global impacts of material flow B
in which local dredging would be ignored. The construction of this indicator does, however, provide the
underlying physical accounts that will allow analysis of impacts, using
those flows important to the impact in question and using appropriate
weights. Someone interested
in the impact of mining, for example, might concentrate on overburden
removed and the toxicity of metals mined.
Over time
it is likely that additional B
nationally relevant B
indicators will be derived from the underlying data and that method and
data will be refined.
(d)
Status of the
Methodology:
(e) Alternative Definitions /
Indicators: The
Total Material Requirement may be more useful when shown on a per capita
or per unit GDP basis. Time
series are especially useful.
4.
Assessment of Data
(a)
Data
Needed to Compile the Indicator: Data on
all material inputs into an economy, including minerals, fossil fuels,
earth movement, dredging, and harvesting of renewable resources through
agriculture, animal husbandry, and forestry.
(b)
National
and International Data Availability: Data
for the construction of this indicators comes from a variety of sources.
To date TMR has been published only for the United States,
Germany, Japan, and the Netherlands. Material flow studies are also
underway, or completed, in Finland, Australia, Sweden, Norway, Italy,
and Brazil. The UK, Chile, and China are also beginning work on physical
accounts. Data for the construction of the indicator is in part
available from the UN Statistical Office on energy consumption and
production, and data is often available by country on imports of raw
materials, semi-manufactures, and finished goods. No one source provides all the data needed for the construction
of this indicator.
(c)
Data
References: See
sections 3(b) and 4(b) above.
5.
Agencies Involved in the Development of the Indicator
Lead
Agency:
World
Resources Institute (WRI)
10 G Street
N.E. Suite 800, Washington D.C. 20002, U.S.A.
Other
Organizations:
Wuppertal
Institute (WI)
Postfach
100480, Doppersberg 19, D-42103, Wuppertal, Germany
http://www.wupperinst.org
National
Institute for Environmental Studies (NIES)
16-2 Onogawa, Tsukuba, Ibaraki 305-0053, Japan
http://www.nies.go.jp/index.html
Centre of
Environmental Science (CML), Leiden University
Van Steenisgebouw, Einsteinweg 2, 2300 RA, Leiden, The Netherlands
http://www.leidenuniv.nl/interfac/cml/ssp/
Institute
for Interdisciplinary Studies of Austrian Universities (IFF), Department
of Social Ecology
Schottenfeldgasse
29, A-1070 Vienna, Austria
http://www.univie.ac.at/iffsocec
6.
References
(a)
Readings:
A.
Adriaanse et al. 1997. "Resource Flows: The Material Basis of
Industrial Economies". Washington D.C. World Resources Institute.
E.
Matthews et al. 2000. "The Weight of Nations: Material Outflows
from Industrial Economies". Washington D.C. World Resources
Institute.
(a)
Internet
sites:
As
mentioned above.
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