Australian Bureau of Statistics
5206.0 - Australian National Accounts: National Income, Expenditure and Product, Sep 2002
Previous ISSUE Released at 11:30 AM (CANBERRA TIME) 24/01/2003
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Feature Article - Accounting for the environment in the national accounts
While land accounts for 84% of the value of Australia's economic environmental assets, the value of rural land accounts for only 12% of the total value of land. Subsoil assets account for 15% and timber (native and plantation) accounts for 1% of Australia's economic environmental assets (based on table S29.2). No values are included for water or fish stocks, or other environmental assets outside the SNA93 asset boundary.
The value of environmental assets in current prices grew strongly during the 1990s, increasing by 84% between 30 June 1993 and June 30 2001. Much of this growth was due to rising prices. Environmental assets grew in volume terms by 18% during the same period (based on table S29.3).
Chain volume estimates of subsoil assets increased by 29% between 30 June 1993 and 30 June 2001, compared with growth of over 160% in current prices (graph S29.4). The strong volume growth has been due to new discoveries exceeding extractions during this period. The current price growth has been driven by increasing prices in significant minerals such as iron ore, magnesite, crude oil, condensate, and LPG, and falling real discount rates. Minerals deposits cannot be extracted all at once, but are extracted over a long time period, and a discount rate is needed to calculate the NPV of future extractions.
The volume estimates of native standing timber fell by 8% over the same period, while the current price estimates were increasing (graph S29.5). Volume estimates have fallen due to logging of native forests and the protection of some forests, resulting in their removal from the economic production boundary of the national accounts.
While the area of land is unlikely to change very much during the normal course of events, volume change also includes changes in quality due to natural processes, soil conservation and other land improvement measures, land degradation due to human activity, and the rezoning of land so that it is available for higher value uses. The practical task of splitting value changes into their price and volume components is a difficult one. As an interim approach, the ABS has calculated the growth in volume of urban land at half the rate of growth in the volume of overlying construction. Zero volume growth is assumed for rural land. This assumes that land degradation, reclassification and land improvement net to zero for rural land.
Transactions - the national income, expenditure and production accounts
The transaction accounts of the ASNA measure production, incomes, consumption, capital and financial flows during the accounting period. GDP is the most readily identifiable statistic from the national accounts. Of most interest in the context of environmental accounting is the way environmental assets are used in the production process to produce goods and services for consumption, capital investment or export. However, the services provided by the environment are often either implicit in the values for other items or they are excluded as they are costed at zero price.
Where there are explicit rents for the use of natural assets, they are shown in the item 'rent on natural assets' in the sector income accounts. The general government sector received $2.6b in resource rents in 2000-01 (mainly from petroleum, mining and forestry royalties). Many environmental assets (e.g. land) are used by their owners for which there is no money transaction.
In terms of GDP, the value of the services provided by the environment are implicit in the value of the output of the products produced and the incomes derived from their sale. In 2000-01, the current price industry gross value added of the agriculture, forestry and fishing industry accounted for 3.5% of total gross value added, while the mining industry accounted for 5.2%. The value added also reflects the input of labour and produced capital, as well as natural capital.
The value of new additions to environmental assets, such as discoveries of subsoil assets or natural growth in native standing timber, are not included as income or GDP. However, the cost of mineral exploration is regarded as fixed capital formation, and is reflected in GDP as the creation of an asset.
As mentioned, no deduction is made from income for the depletion or degradation of the natural environment. Thus, '...a country could exhaust its mineral resources, cut down its forests, erode its soil, pollute its aquifers, and hunt its wildlife to extinction, but measured income would not be affected as these assets disappeared' (Repetto et al. 1989).
A satellite account for the environment
The national accounts have a wide range of potential uses for policy making and economic and social research, and thus it is unlikely that the core accounts will be able to meet all possible objectives. In recognition of this, satellite accounts allow for a more flexible approach by providing frameworks that are linked to the national accounts, but focusing on a certain aspect of social or economic life. Satellite accounts also allow for standard concepts to be varied to suit particular studies within the context of the national accounts.
An environmental satellite account could take a number of forms and have a number of layers of detail. The ABS work program has focused on compiling asset accounts and accounts which decompose the changes in the value of assets during a period. The latter accounts can be used for adjusting the national accounts for the depletion of and additions to specific environmental assets in a satellite account framework.
Depletion is defined in the SNA93 (12.29 and 12.30) as the:
'...reduction in the value of deposits of subsoil assets as a result of the physical removal and using up of the assets, ... the depletion of water resources, and the depletion of natural forests, fish stocks in the open seas and other non-cultivated biological resources as a result of harvesting, forest clearance, or other use.'
Depletion in an economic sense results because the value of the resource stock has been lowered through its use in a productive activity, and the use has reduced the asset's ability to produce an income stream in the future. In this sense depletion is analogous to depreciation of produced assets whereby the current value of the stock of fixed assets declines from normal use.
Physical depletion may not necessarily equate to economic depletion in cases where asset values are low or the resource life is long. While the physical dimension of depletion can be fairly readily observed in practice, its value cannot. This is because the mineral or other natural resource product is not what is being valued - rather it is the decline in the value of the mineral asset below the ground or of the standing timber in the forest. Generally, one has to resort to capital theory to undertake this valuation. In capital theory the value of depletion is a derivative of the amount of the resource extracted and the resource rent.
The resource rent is the value of the flow of capital services provided by a natural asset. It is calculated as the value of the output of the natural resource production (e.g. coal, oil) after the intermediate expenses, returns to labour (wages), returns to produced capital (profits accruing from the use of produced capital), and return to government (taxes) have been removed. Algebraically, the resource rent is represented as:
RR = (p - c) * Q
where RR = resource rent, p = unit price, c = unit cost (includes wages, intermediate costs, normal return to produced capital, and taxes), Q = quantity extracted.
The resource rent in each period is discounted to derive the NPV of the natural asset:
Vt = nS RR
where V = NPV, r = discount rate, n = asset life.
Depletion can be shown to be equal to the resource rent in the year minus a return (income) on the natural resource asset.
dt = Vt-1 - Vt = RRt - rVt
where d = depletion.
Where the total stocks of an asset are unknown, discoveries of new stocks of subsoil assets or growth in biological assets may increase the stock of a resource so that the level of currently exploitable reserves from which the economic valuation is derived is rising rather than falling. How to account for additions is a vexed issue. In the national accounts, the value of mineral exploration is included as a separate produced asset and is therefore in income and GDP. It could be argued that this should be replaced with the actual value of discoveries.
The following sections focus on subsoil, land and forest assets respectively.
Subsoil assets are considered to be economic when they have a high geological assurance, extraction is expected to be profitable at the prevailing price and technology, and they are owned by an economic entity (usually the government). In the Australian balance sheets economic demonstrated resources include both proven and probable reserves.
Although SNA93 recommends that assets should be valued at their current market price, for many natural assets it is not possible to observe the market price directly as there is little trading of undeveloped stocks in the marketplace. The next best method is to value assets as the NPV of the future expected earnings, which is theoretically equivalent to the market value. This is the approach adopted in the national balance sheet and in deriving estimates of the value of depletion and additions to subsoil assets presented in table S29.6.
Year-to-year changes in the value of subsoil assets for Australia can be decomposed into revaluations, depletion and discoveries. Revaluations capture the change in prices of the existing stock.
The depletion in any one year is the change in the value of the asset between the beginning and end of the year arising purely from the extraction of minerals. As can be seen from graph S29.7, the depletion of crude oil accounts for a high proportion of the total depletion estimate. This is a reflection of crude oil's relative scarcity and high value.
A discovery occurs when previously unknown stocks of minerals are found and delineated. It is valued using the same NPV techniques described earlier. In the national accounts the value of a new discovery in itself is not considered as production or income because it is a gift of nature. However, the cost of mineral exploration is considered as production and included in income and GDP.
One approach that could be considered in a satellite account is to include the value of a discovery as production and income and to treat the exploration cost as intermediate input to the production of discoveries. As shown in graph S29.8, the value of discoveries shows an erratic pattern which, under such an approach, would flow through to income. A possible variation on the concept could be to record the value of discoveries as an accrual over the average period of exploration in order to smooth the income flow.
As long as the value of discoveries continues to outpace or equal the value of depletion the activity can be seen to be sustainable. This is illustrated in graph S29.9.
Where land is used sustainably, it has an infinite life and therefore no adjustment for depletion is required - the whole value of the resource rent would rightly be considered as income. However, where land is being degraded due to economic activity, an adjustment to income for land degradation is applicable. As for subsoil assets discussed above, any economic costs should be offset against the benefits (income) derived from agricultural land use.
In the context of economic depletion used here, land degradation represents the year-to-year decline in the capital value of land resulting from economic activity (after deducting price rises due to inflation). Looked at another way it is equivalent to the year-to-year change in the NPV of the lost resource rent resulting from the declining productive capacity of the land. As such, it stops well short of a full measure of the cost of land degradation such as the cost to environmental systems and public infrastructure. The latter would, however, be captured in the national accounts estimates for consumption of fixed capital.
Changes in the value of agricultural land can be ascertained from data on market values or land rates data. However, data for land values are affected by a host of factors other than changes in productive capacity from the impact of land degradation, including inflation, technological advances and changes in land use due to rezoning, subdivision and 'lifestyle' considerations (Roberts 1997).
Two recent national studies used different approaches to measuring economic losses due to land degradation:
To compare the results, either the former estimate has to be converted to a lost profit stream or the latter has to be capitalised. Profit at full equity is a measure of the net returns to land and water resources used for agriculture, and the managerial skill of land managers. Adjusting this concept to resource rent by removing the returns to the manager's labour and produced capital, and using a real discount rate of 5.8%, the capitalised value of the lost resource rent due to all past degradation is $16.4b in 1996-97. The results using this method are sensitive to the discount rate. The real discount rate has been derived as the long-term government bond rate adjusted by the consumer price index in 1996-97.
While the estimates mentioned above represent the accumulated value of losses in land value due to all past degradation since European settlement, it is the year-to-year increment in the value of degradation that should be deducted from farm income in each period (consistent with the treatment of depreciation of produced assets). There are a number of issues to consider, including whether to deduct degradation from income in the periods when the effect becomes evident, or in the periods in which it was caused (sometimes decades or even a century earlier). The latter would seem appropriate in economic accounting. For the purpose of the indicative estimates contained in this article, it has been assumed that degradation accumulated evenly over a period of 50 years. Using the $14.2b figure for lost land value, the annual increment (in 1999 dollar terms) is $284m per year. Using the alternative estimate of $16.4b, degradation is $329m per year (in 1997 dollar terms). The annual losses are adjusted using the chain price index for GDP to arrive at degradation in current prices. The higher value has been taken into the summary estimates provided in table S19.11. For estimates post-1999 it has been assumed that degradation will accrue at the same rate. No adjustments have been made to account for land improvements that might reduce the future loss of resource rent. The resulting series are shown in graph S29.10.
Forests are renewable biological resources. There are two types of forest: old-growth native forests (95% of the area of all Australian forests) and plantations. Broadleaved and coniferous plantation standing timber are treated as categories of produced assets in the national accounts, as the growth is under the direct control, responsibility and management of the owner. They are classified as inventories. Native forests are treated as non-produced assets as, although they may be owned and available for use, their growth is not the result of an economic process. As for other non-produced assets, the depletion of native forest assets due to harvesting is not charged against income in the national accounts.
The valuation of the depletion of renewable assets presents a different set of issues to non-renewable assets, as it may be possible to replace (over time) the part of the asset that is used in the current period. Where a forest is harvested sustainably, no depletion adjustment is required. SEEA suggests that either depletion and additions can be calculated separately, or that just the net depletion could be calculated. Where old-growth will not be replaced, only a depletion adjustment will apply. In some areas, however, old-growth forest will become second-growth forest. Where extractions (i.e. timber harvesting) still exceed growth, depletion should exceed additions. Once the transition period from old-growth forest to second-growth forest is complete, growth may exceed harvest. In this case yield can be considered economically sustainable.
In principle, the best approach would be to calculate both depletion and addition adjustments as this allows for the two impacts to be explicitly identified. Depletion is calculated as the change in the NPV of the forest arising from the harvesting of timber (similar to subsoil assets). The value of additions is the NPV of the growth in any one year. The compilation of this series requires data on the annual increase in forest cover.
It is also possible that forests will come into or out of scope of the balance sheet due to land-use management decisions or catastrophic events (e.g. bushfires) that affect the volumes of standing timber. Such changes should not be recorded as depletion because they are not regular economic events. Rather, they should be included as either positive or negative additions to assets in the balance sheet and recorded in the 'other change in assets account'.
Estimates are not yet available for depletion of native forests. However, given that the value of native forests on the national balance sheet is $2.6b compared with $172.9b for subsoil assets, it is expected that depletion of the former will be relatively insignificant. This of course is taking an economic view only, and does not account for damage to intrinsic non-monetary values such as ecosystem services, biodiversity and aesthetic/recreational values.
Adjusting the national accounts
It was stated earlier in this article that there is an asymmetry in the national accounts between the treatment of produced assets such as buildings, and plant and natural (non-produced) assets. Depreciation of produced assets (termed consumption of fixed capital in the national accounts) is deducted to derive the various 'net' income measures in the national accounts such as net domestic product (NDP), net operating surplus (NOS), net national income and net saving. No such deduction is made for natural assets when they are used up or degraded as a result of economic activity. The net measures thus fall short of being sustainable concepts of income, although they are superior to the various 'gross' measures in the national accounts in this respect.
The experimental estimates derived for the value of depletions and discoveries of subsoil assets and the degradation of agricultural land are indicative of adjustments that could be made to the national accounts in the context of a satellite account, and are illustrated in table S29.11. Depletion adjustments unambiguously lower the net values. If the value of discoveries is included in income in place of the value of mineral exploration, the net effect of that adjustment can be positive or negative.
The net saving levels are changed by the same amount as for NOS, but the nation's net lending position is left unchanged.
Adjusting the national accounts for depletion and additions of subsoil assets also affects growth rates, which may increase or decrease. As table S29.12 shows, the adjustments have the biggest impact on both NDP and NOS in 1994-95, due to the low value of subsoil asset additions in that year compared to the previous one.
Energy and greenhouse gas emissions
A satellite account for energy and greenhouse gas emissions using the input-output framework was published by the ABS in Energy and Greenhouse Gas Emissions Accounts, Australia (4604.0) in 2001. It presented information on the supply, use and stock of primary energy resources, supply and use of secondary energy products, and greenhouse gas emissions associated with the use of these energy resources. Energy use and emissions of greenhouse gases were linked with economic data and tracked through the economy so that emissions were allocated to final end users of products, rather than to the producers of products.
Of the total net energy supply (13,397 PJ), 66% was exported, 7% was consumed by households and 18% consumed by industry. Together household electricity use and motor vehicle use by households accounted for over 30% of Australia's energy-related greenhouse gas emissions.
Future work and further information
The work program on environmental satellite accounting is continuing. The ABS hopes to extend the depletion adjustment to include native forests. Other areas of work will be to highlight environmental protection expenditures and to look at extending the economic asset boundary to include the value of water and possibly fish. Work on the valuation of environmental damage (externalities associated with human and economic activity) is an undeveloped field of research and it is unlikely that the ABS will have the capacity to make advances in this area in the foreseeable future.
ABS (Australian Bureau of Statistics) 2001a, Australian System of National Accounts, 2000-01, cat.no. 5204.0, ABS, Canberra.
ABS 2001b, Energy and Greenhouse Gas Emissions Accounts, 1992-93 to 1997-98, cat. no. 4604.0, ABS, Canberra.
ABS 2002, Australian National Accounts: National Income, Expenditure and Product, June 2002, cat. no. 5206.0, ABS, Canberra.
Commission of the European Communities, International Monetary Fund, Organisation for Economic Co-operation and Development, United Nations, World Bank 1993, System of National Accounts 1993, Brussels/Luxemburg, New York, Paris, Washington D.C.
Kemp A & Connell P 2001, Impact of Land Degradation on Australian Agriculture: A Land Values Approach, ABARE report to National Land and Water Resources Audit.
National Land and Water Resources Audit 2002, Australians and Natural Resource Management 2002, National land and Water Resources Audit, Canberra.
Repetto R, Magrath W, Wells M, Beer C & Rossini F 1989, Wasting Assets: Natural Resources in the National Income Accounts, World Resource Institute, Washington D.C.
Roberts B 1997, 'Implications of Land Use Changes for the Economics of Agriculture', The Valuer and Land Economist, May 1997.
United Nations 1993, Integrated Environmental and Economic Accounting, New York.
United Nations Statistical Commission 2002, System of Integrated Environmental and Economic Accounting (Draft SEEA 2002). Draft report of the London Group on Environmental Accounting.
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This page last updated 8 December 2006