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Contributions of individual countries’ emissions to climate change and their uncertainty

Contributions of individual countries’ emissions to climate change and their uncertainty,10.1007/s10584-010-9930-6,Climatic Change,Niklas Höhne,Helcio

Contributions of individual countries’ emissions to climate change and their uncertainty   (Citations: 7)
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We have compiled historical greenhouse gas emissions and their uncertainties on country and sector level and assessed their contribution to cumulative emissions and to global average temperature increase in the past and for a the future emission scenario. We find that uncertainty in historical contribution estimates differs between countries due to different shares of greenhouse gases and time development of emissions. Although historical emissions in the distant past are very uncertain, their influence on countries’ or sectors’ contributions to temperature increase is relatively small in most cases, because these results are dominated by recent (high) emissions. For relative contributions to cumulative emissions and temperature rise, the uncertainty introduced by unknown historical emissions is larger than the uncertainty introduced by the use of different climate models. The choice of different parameters in the calculation of relative contributions is most relevant for countries that are different from the world average in greenhouse gas mix and timing of emissions. The choice of the indicator (cumulative GWP weighted emissions or temperature increase) is very important for a few countries (altering contributions up to a factor of 2) and could be considered small for most countries (in the order of 10%). The choice of the year, from which to start accounting for emissions (e.g. 1750 or 1990), is important for many countries, up to a factor of 2.2 and on average of around 1.3. Including or excluding land-use change and forestry or non-CO2 gases changes relative contributions dramatically for a third of the countries (by a factor of 5 to a factor of 90). Industrialised countries started to increase CO2 emissions from energy use much earlier. Developing countries’ emissions from land-use change and forestry as well as of CH4 and N2O were substantial before their emissions from energy use.
Journal: Climatic Change , vol. 106, no. 3, pp. 359-391, 2011
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    • ...We use for the climate attribution calculations generated by the MATCH climate model, as described in den Elzen et al. (2005a) combined with a historical emissions dataset at the level of 192 UN countries, as described in Höhne et al. (2008) (see Appendix I). These calculations are further extended by our own calculations for contributions according to the capacity to pay...
    • ...We use the default case CBDR scenario 2 as a reference, in line with the choices of the default cases made in other studies (den Elzen et al. (2005a) and Höhne et al. (2008))...

    Rob Dellinket al. Common-but-differentiated-Responsibilities for adaptation financing: a...

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