Agricultural methane and nitrous oxide emissions represent around 10–12% of total anthropogenic GHG emissions and have a key role to play in achieving a 1.5 °C (above pre-industrial) climate stabilization target. Using a multi-model assessment approach, we quantify the potential contribution of agriculture to the 1.5 °C target and decompose the mitigation potential by emission source, region and mitigation mechanism. The results show that the livestock sector will be vital to achieve emission reductions consistent with the 1.5 °C target mainly through emission-reducing technologies or structural changes. Agriculture may contribute emission reductions of 0.8–1.4 Gt of CO₂-equivalent (CO₂e) yr⁻¹ at just US$20 per tCO₂e in 2050. Combined with dietary changes, emission reductions can be increased to 1.7–1.8 GtCO₂e yr⁻¹. At carbon prices compatible with the 1.5 °C target, agriculture could even provide average emission savings of 3.9 GtCO2e yr⁻¹ in 2050, which represents around 8% of current GHG emissions.

Taking the European Union (EU) as a case study, we simulate the application of non-uniform national mitigation targets to achieve a sectoral reduction in agricultural non-carbon dioxide (CO₂) greenhouse gas (GHG) emissions. Scenario results show substantial impacts on EU agricultural production, in particular, the livestock sector. Significant increases in imports and decreases in exports result in rather moderate domestic consumption impacts but induce production increases in non-EU countries that are associated with considerable emission leakage effects. The results underline four major challenges for the general integration of agriculture into national and global climate change mitigation policy frameworks and strategies, as they strengthen requests for (1) a targeted but flexible implementation of mitigation obligations at national and global level and (2) the need for a wider consideration of technological mitigation options. The results also indicate that a globally effective reduction in agricultural emissions requires (3) multilateral commitments for agriculture to limit emission leakage and may have to (4) consider options that tackle the reduction in GHG emissions from the consumption side.

Russia, Ukraine and Kazakhstan (RUK) are major players in the international grain markets and their exports help to improve global grain availability and hence food security. However, during the last decade the availability of RUK grain exports was repeatedly diminished by harvest failures and further reduced by the introduction of export restrictions. By simulating a reoccurrence of the 2010 RUK harvest situation this paper assesses the impact of grain harvest failures and subsequent temporary export restrictions (bans, quotas, taxes) on national and international food security, specifically quantifying the effects on agricultural market prices and quantities. For the analysis AGLINK-COSIMO, a recursive-dynamic, partial equilibrium, supply–demand model, has been employed. Simulation results highlight the importance of RUK’s grain production for world markets and global food security, indicating substantial price increases due to limited grain exports from RUK. Moreover, scenario results illustrate that temporary RUK export restrictions can considerably aggravate the situation on world grain markets, with particularly adverse effects for grain net importing countries. At the same time, results show that for a country like Ukraine, i.e. a country usually exporting large shares of its total grain production, the introduction of export restrictions could potentially result in decreases of domestic consumer prices to a level even below a situation with normal weather conditions. The results put international trade policy into focus and underline the necessity of greater cooperation on the part of exporting countries in order to avoid importing countries being denied necessary grain supplies.