What is the fine-grained topic of the following text: Editorial .. Empirical Assessment of a Pre-European Societal Collapse on Rapa Nui ... With globalization and growing environmental problems, we might also see ... inwash had begun by 2400 BP, but material did not appear to have .. To ride a motorcycle is also 'raw'. Only return the topic.
Pre-European Societal Collapse on Rapa Nui (Easter Island)