This chapter proposes expanding the frameworks of Oneness and Security by incorporating four key dimensions: biophysical, economic, social, and governance. The biophysical dimensions focus on the condition and capacity of natural resources, while the economic dimension highlights the costs of degradation and biodiversity loss. The social dimension emphasises human behaviours and equity, and the governance dimension stresses the importance of coordinated policies. By integrating these dimensions, the chapter advocates for a holistic approach to planetary health, fostering sustainable, integrated policies to address global challenges such as climate change, food security, and public health. The concept of security, as defined by the Copenhagen School, extends beyond traditional national and state concerns to include global existential threats like food, water, and energy security. Securitisation is categorised into strong and weak forms. Strong securitisation frames an issue as an immediate existential threat, justifying drastic measures that bypass regular political processes, such as emergency powers or military interventions. In contrast, weak securitisation acknowledges threats without resorting to extreme actions, focusing on policy adjustments within standard political frameworks. This chapter advocates for weak securitisation, recognising global challenges while preserving democratic governance and avoiding disproportionate measures. The concept of “One Security” is explored through two approaches. The first focuses on planetary objects and phenomena, such as soil, water, and biodiversity, examined through dimensions of capacity, condition, capital, connectivity, and codification. The second approach addresses global existential challenges like food, water, and climate change, emphasising immediate threats to humanity and ecosystems. This approach aligns with traditional security concerns, urging proactive measures to mitigate risks. The chapter advocates for this second approach, while acknowledging that the first approach has merit, highlighting the need for coordinated global responses to address urgent, interconnected global challenges, integrating environmental, social, and governance dimensions.