Colomb Vincent auteur aut IRD Touchemoulin O. auteur aut IRD Bockel L. auteur aut IRD Chotte Jean-Luc auteur aut IRD Martin S. auteur aut IRD Tinlot M. auteur aut IRD Bernoux Martial auteur aut IRD text journalArticle eng text/pdf born digital access This letter is intended to help potential users select the most appropriate calculator for a landscape-scale greenhouse gas (GHG) assessment of activities for agriculture and forestry. Eighteen calculators were assessed. These calculators were designed for different aims and to be used in different geographical areas and they use slightly different accounting methodologies. The classification proposed is based on the main aim of the assessment: raising awareness, reporting, project evaluation or product assessment. When the aims have been clearly formulated, the most suitable calculator can be selected from the comparison tables, taking account of the geographical area and the scope of the calculation as well as the time and skills required for the calculation. The main issues for interpreting GHG assessments are discussed, highlighting the difficulty of comparing the results obtained from different calculators, mainly owing to differences in scope, calculation methods and reporting units. A major problem is the poor accounting for land use change; the calculators are usually able to account satisfactorily for other emission sources. One of the main challenges at landscape-scale level is to produce a realistic assessment of the various production systems as the uncertainty levels are very high. The results should always give some indication of the link between GHG emissions and the productivity of the area, although no single indicator is able to encompass all the services produced by agriculture and forestry (e. g. food, goods, landscape value and revenue). specialized landscape carbon calculators greenhouse gases GHG emissions AFOLU mitigation 076 068 021 8 1 015029 2013 1748-9326 https://www.documentation.ird.fr/hor/fdi:010060834 10.1088/1748-9326/8/1/015029 1748-9326 [F B010060834] https://www.documentation.ird.fr/hor/fdi:010060834 https://www.documentation.ird.fr/intranet/publi/2013/05/010060834.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2013-05-31 2017-08-23 fdi:010060834 fre