Peter Witzke

Future scenarios of nitrogen in Europe

The future effects of nitrogen in the environment will depend on the extent of nitrogen use and the practical application techniques of nitrogen in a similar way as in the past. Projections and scenarios are appropriate tools for extrapolating current knowledge into the future. However, these tools will not allow future system turnovers to be predicted.

An economic assessment of GHG mitigation policy options for EU agriculture

The report presents an overview of the historical and projected development of agricultural GHG emissions in the EU. The major objective of the report is to present the improvements made in the CAPRI modelling system with respect to GHG emission accounting and especially regarding the implementation of endogenous technological mitigation options. Furthermore, the CAPRI model was applied to provide a quantitative assessment of illustrative GHG mitigation policy options in the agricultural sector, and their production and economic implications.

Extension of the CAPRI model with an irrigation sub-module

The study enables the CAPRI model to make simulations of the potential impact of climate change and water availability on agricultural production, as well as is looking at the sustainable use of water and the implementation of water-related policies including water pricing. To investigate the role of irrigation as adaptation strategy to climate change, we define a set of simulation scenarios that account for the likely effects on water price, crop yields, water availability and irrigation efficiency.

Risk of increased food insecurity under stringent global climate change mitigation policy

Food insecurity can be directly exacerbated by climate change due to crop-production-related impacts of warmer and drier conditions that are expected in important agricultural regions1–3. However, efforts to mitigate climate change through comprehensive, economy-wide GHG emissions reductions may also negatively affect food security, due to indirect impacts on prices and supplies of key agricultural commodities4–6. Here we conduct a multiple model assessment on the combined effects of climate change and climate mitigation efforts on agricultural commodity prices, dietary energy availability and the population at risk of hunger. A robust finding is that by 2050, stringent climate mitigation policy, if implemented evenly across all sectors and regions, would have a greater negative impact on global hunger and food consumption than the direct impacts of climate change. The negative impacts would be most prevalent in vulnerable, low-income regions such as sub-Saharan Africa and South Asia, where food security problems are already acute.Economy-wide GHG emissions reductions may negatively affect food security. Stringent mitigation policies, modelled as carbon prices, are shown to lead to an increase in production costs, food prices and the population’s risk of hunger.

Exploring the feasibility of integrating water issues into the CAPRI model

Although numerous modelling efforts have integrated food and water considerations at the farm or river basin level, very few agro-economic models are able to jointly assess water and food policies at the global level. The present report explores the feasibility of integrating water considerations into the CAPRI model. First, a literature review of modelling approaches integrating food and water issues has been conducted. Because of their capability to assess the impacts of water and food policies at the global level, three agro-economic models (IMPACT, WATERSIM and GLOBIOM) have been analysed in detail. Second, the potentiality of CAPRI to model water has been assessed. Thanks to the programming approach of its supply module, CAPRI shows a high potentiality to integrate environmental indicators as well as to enter new resource constraints (land potentially irrigated, irrigation water) and input-output relationships. At least in theory, the activity-based approach of the regional programming model in CAPRI allows differentiating between rainfed and irrigated activities. The suggested approach to include water into the CAPRI model involves creating an irrigation module and a water use module. The development of the CAPRI water module will enable to provide scientific assessment on agricultural water use within the EU and to analyze agricultural pressures on water resources. The feasibility of the approach has been tested in a pilot case study including two NUTS 2 regions (Andalucia in Spain and Midi-Pyrenees in France); its choice having been mainly motivated by data availability. Preliminary results are presented, highlighting the interrelations between water and agricultural developments in Europe.

Scenar 2030 - Pathways for the European agriculture and food sector beyond 2020 (Summary report)

Analysing stylised scenarios with economic modelling tools reveals complex relations, incentives and trade-offs of the different policy instruments, in particular regarding the environmental dimension. Marginal areas of the EU are most vulnerable to drastic policy changes.