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At 2 pm., on March, 25 th 2024, in room C1.0.06, at AgroParisTech, Roxane Photinodellis will defend her thesis "Trade-off between the effectiveness of net GHG emissions mitigation policies in the agricultural sector and the costs associated with monitoring GHG emissions and carbon sequestrationA", co-supervised Laure Bamière and Stéphane De Cara.

Abstract:

The aim of this thesis is to explore the trade-off between the effectiveness of net GHG mitigation policies and the costs associated with monitoring emissions and carbon sequestration. In the first contribution, our objective is to estimate the marginal cost and effectiveness in terms of mitigating net GHG emissions for several policies partially covering emission sources and sinks. We find that subsidies for total carbon sequestration and for carbon contained only in above-ground biomass are more cost-effective than a GHG tax. In the second contribution, at the scale of the plot, we examine the costs of participation in two types of carbon contracts, one model-based and the other results-based. For the latter type, we take into account the risk aversion of farmers regarding the uncertainty surrounding carbon sequestration results. The goal is to highlight the trade-offs regarding risk-sharing between the regulator and farmers, while defining theoretical conditions for farmer participation in these contracts. In the third contribution, at the scale of a French region, we compare the cost-effectiveness of different carbon contracts, whether results-based, model-based, or practice-based. This analysis takes into account some of the heterogeneity among farmers. Our results indicate that the most cost-effective contract form is to remunerate farmers per hectare for the implementation of intra-parcel agroforestry.