Sustain refers to the ability to maintain or support processes over the long term, particularly in the context of environmental health and resource management. It emphasizes the importance of using resources in a way that meets current needs without compromising the ability of future generations to meet theirs. This concept is crucial in addressing issues like climate change and biodiversity loss. In practice, sustainability involves adopting practices that reduce waste, conserve energy, and promote the use of renewable resources. By focusing on sustainable development, societies can create a balance between economic growth and environmental protection, ensuring a healthier planet for all living beings.