New actors and scales of agriculture: A land system science perspective

The study of land systems aims to disentangle and understand the range of interactions between humans and the land they use. It takes, among others, environmental, biophysical, economic, political, technological, and social perspectives to comprehend how coupled human-environmental systems work, who decides over them, and how they could or should be transformed. Land systems take a central position in human livelihoods and environmental issues, and are a crucial parameter in many Sustainable Development Goals. This thesis starts from the premise that land systems are increasingly changing in ways that are poorly understood from a conventional land system science perspective. Conventional land system science rests on assumptions of mostly gradual processes, driven by a somewhat narrow range of actors, such as family farmers or local land administrations. However, large-scale land acquisitions, arguably the most dramatic land system changes of the 21st century, are definitively non-gradual, operate at scales that are orders of magnitude larger than typical smallholder dynamics, and are instigated by an international group of actors with a very different set of priorities than traditional actors. Pejoratively known as land grabs, large-scale land acquisitions globally cover an area over double the size of Germany, yet as a process, they have not been introduced in land system change models. This lacuna is significant, not only because large-scale land acquisitions cover large areas, but also because they profoundly change the relation that humans have with land as a resource. For example, the conversion of swidden landscapes to rubber monocultures in Southeast Asia causes a significant loss of agro-environmental diversity, but also a complete overhaul of livelihoods, culture, tradition, diets, and more. Furthermore, the constellation of decision-making concerning land is changed, and therefore, the possibilities for sustainable transitions are different. Upon closer in