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Dealing with Uncertainty in GHG Inventories: How to Go About It?

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Coping with Uncertainty

Abstract

The assessment of greenhouse gases emitted to and removed from the atmosphere is high on both political and scientific agendas. Under the United Nations Framework Convention on Climate Change, Parties to the Convention publish annual or periodic national inventories of greenhouse gas emissions and removals. Policymakers use these inventories to develop strategies and policies for emission reductions and to track the progress of these policies. However, greenhouse gas inventories (whether at the global, national, corporate, or other level) contain uncertainty for a variety of reasons, and these uncertainties have important scientific and policy implications. For scientific, political, and economic reasons it is important to deal with the uncertainty of emissions estimates proactively. Proper treatment of uncertainty affects everything from our understanding of the physical system to the economics of mitigation strategies and the politics of mitigation agreements. A comprehensive and consistent understanding of, and a framework for dealing with, the uncertainty of emissions estimates should have a large impact on the functioning and effectiveness of the Kyoto Protocol and its successor. This chapter attempts to pull together relevant fragments of knowledge, allowing us to get a better picture of how to go about dealing with the uncertainty in greenhouse gas inventories.

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Notes

  1. 1.

    The issue of great uncertainty vs. small change also arises for small, intermediate, reduction targets. For instance, the EU discusses annual reduction steps in the context of an overall (EU-wide) GHG emission reduction of 20% by 2020 compared to 2005 [11, p. 7]. These steps follow a linear reduction path and are small ( < 2% per year; not compounded).

  2. 2.

    It is noted that attempts exist to put one of these six techniques to analyze uncertain emission changes, the verification time concept, on a stochastic basis (see Ermolieva et al., herein; and also [27] and [28]). It is correct to say that this technique still undergoes scientific scrutiny and awaits adjustment in order to operate in a preparatory mode.

  3. 3.

    See http://www.iiasa.ac.at/Research/FOR/unc_overview.html for an overview on IIASA’s monitoring reports and the countries that are monitored.

  4. 4.

    For the authors’ study and numerical results see http://www.iiasa.ac.at/Research/FOR/unc_prep.html. Referring readers to this website facilitates easy replication for follow-up studies or, as in this case, avoiding duplication.

  5. 5.

    See, for instance, the so-called undershooting (Und) concept: Excel file available via numerical results to [23] at http://www.iiasa.ac.at/Research/FOR/unc_prep.html: Worksheet Undershooting 4:column C = Kyoto commitments δ KP for country groups 1–8 (see also Table 11.2); column E = the accepted risk α that a country’s true emissions in the commitment year/period are equal to, or greater than, the country’s true Kyoto target (risk α can be grasped although true emissions and targets derived from them are unknown by nature); and columns F–N or U–AC (restricted to rows 14–16) = presumed relative uncertainty ρ of the country’s reported emissions.The Und concept requires undershooting of the countries’ Kyoto targets in the commitment year in order to handle and decrease risk α (see columns F–N, rows ≥ 17, for the required undershooting). Varying δ KP while keeping the relative uncertainty ρ and the risk α constant (e.g., at ρ = 15% and α = 0. 3) exhibits that countries complying with a smaller δ KP are better off than countries that must comply with a greater δ KP (see columns U–AC, rows ≥ 17, for the modified emission limitation or reduction target, which is the sum of the agreed target under the Kyoto Protocol plus the required undershooting). Such a situation is not in line with the spirit of the Kyoto Protocol!

  6. 6.

    See, for instance, the so-called combined undershoot and verification time (Und&VT) concept: Excel file available via numerical results to [23] at http://www.iiasa.ac.at/Research/FOR/unc_prep.html: Worksheet Und&VT 1: Fig. 1 therein. The Und&VT concept requires a priori detectable emission reductions, not limitations. That is, it requires the Protocol’s emission limitation or reduction targets to be corrected for nondetectability through the introduction of an initial or obligatory undershooting so that the countries’ emission signals become detectable before the countries are permitted to make economic use of their excess emission reductions. This nullifies, de facto, the politically agreed targets under the Kyoto Protocol!

  7. 7.

    The situation would be different if the nonuniformity of the emission limitation or reduction commitments would be the outcome of a rigorously based process resulting in a straightforward rule that applies equally to all countries as would be the case, for instance, under the so-called contraction and convergence approach (e.g., [34, Sect. 2.3.2], [35]).

  8. 8.

    In their recent study [38, Table 1] show that, making use of global carbon budget data between 1959 and 2006, the efficiency of natural carbon sinks to remove atmospheric CO2 has declined by about 2.5% per decade. Although this decline may look modest, it represents a mean net “source” to the atmosphere of 0.13 PgC y − 1 during 2000–2006. In comparison, a 5% reduction in the mean global fossil emissions during the same time period yields a net “sink” of 0.38 PgC y − 1. Thus, deteriorating natural carbon sinks as a result of climate change or man’s direct impact exhibit the potential to offset efforts to reduce fossil fuel emissions. This shows that man’s impact on nature is indeed not negligible and stresses the need to look at the entire system, that is, to develop a FCA system where emissions and removals and their trends are monitored in toto.

  9. 9.

    This view of treating subsystems individually and differently runs counter to the approach typically taken. The tendency has been to treat subsystems collectively and equally and to dispose over a wide range of options in order to minimize costs or maximize benefits resulting from the joint emissions reduction of GHGs and air pollutants (e.g., [40], [41, (77)], [42]).

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Jonas, M., White, T., Marland, G., Lieberman, D., Nahorski, Z., Nilsson, S. (2010). Dealing with Uncertainty in GHG Inventories: How to Go About It?. In: Marti, K., Ermoliev, Y., Makowski, M. (eds) Coping with Uncertainty. Lecture Notes in Economics and Mathematical Systems, vol 633. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-03735-1_11

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