ELEMCOMP is a Complementarity Programming model that portrays the interaction between firm behaviour in markets for emissions permits and that in wholesale electricity markets. It includes multiple competitors in each market and yields insights into many policy and engineering issues. We present results for Ontario.

The computation of greenhouse gas reduction costs by the techno-economic MARKAL model is combined to the climate damage costs analysis (from the literature) in order to study both cooperative and non-cooperative solutions to climate change issues. We present preliminary results based on the new multi-region MARKAL model and on empirical assumptions related to damage curves.

The Atlantic thermohaline circulation (THC) is an important component in the climate system because it strongly influences conditions in the North Atlantic region. Most climate models simulate a reduction of the THC in response to global warming, some even a complete and potentially irreversible shutdown. To avoid such irreversible climate changes, one may design climate policies that curb GHG emissions to levels preventing a THC collapse. To evaluate such mitigation policies, we use a slightly enhanced version (E-MERGE) of the MERGE model of Manne, Mendelsohn and Richels, where the climate module's parameters have been revised according to the latest IPCC findings. This presentation will describe the main features of E-MERGE, briefly discuss conditions of preserving the THC in terms of temperature change (maximum absolute change and maximum rate of change) and contain evaluations of climate mitigation policies that satisfy these additional constraints taking into account uncertainties about climate sensitivity.

A reduced version of MARKAL has been developed to represent the energy system and its impacts on the environment at the level of a city. We describe the implementation of the model through a data base management tool and the creation of a distance treatment scheme allowing the users to construct, submit and optimize their models though the web. We report on the implementation of that model in four cities (Geneva, Gdansk, Thessaloniki, Tel Aviv).