Humboldt-Universität zu Berlin | Thaer-Institute | International Agricultural Trade And Development | News | 01.10.2022: We welcome our new PhD students Peter Mwangi and Martial Houessou 01.10.2022: We welcome our new PhD students Peter Mwangi and Martial Houessou Nov 28, 2022 We welcome our new PhD students Peter Mwangi and Martial Houessou, working on the economy-wide effects of climate change in Sub-Saharan Africa.