Assessing how production and use of resources affect climate change

Climate, land-use, energy and water systems (CLEWS) models are tools for simultaneous consideration of food, energy and water security, targeting governments and policy makers. The models are designed to assess how production and use of these resources may contribute to climate change, and how climate change may affect resource systems. By comparing different technologies and value chains, the models can identify pressure points, and indicate synergies and trade-offs to reach development goals. CLEWS can analyse policy decisions on issues such as the promotion of clean energy, competition for water and agricultural modernisation.

Country case


Mexico City shares the sustainability challenges of other megalopolis around the world. Securing access to water, good air quality, reliable and efficient transport and dignified livelihoods call for well-designed, holistic plans and policies. That is why the Office of the Mayor of Mexico City requested UN support to develop integrated analyses which will inform its 20-year development plan. Using CLEWS and other integrated methodologies, the UN and UNDP are assessing policy options to strengthen the positive interlinkages across various development dimensions and to minimise inevitable trade-offs, in partnership with local and federal government institutions. The objective is to frame alternative scenarios for the management of water, land use, renewable energy, the expansion of public transportation, including electric; as well as economic growth and structural transformation. Preliminary results will be available by mid-2020.