To "be sustainable" means to live, act, or operate in a way that meets current needs without compromising the ability of future generations to meet their own needs. It's about creating and maintaining systems that balance environmental, economic, and social well-being. In essence, it's about ensuring long-term viability and well-being for all. 

 
Here's a breakdown of what it means:
 
Key Aspects of Sustainability:
  • Meeting Present Needs:
    This involves addressing the current demands of society, including economic growth, social progress, and environmental protection. 
     
  • Protecting Future Generations:
    Sustainability aims to preserve resources and the environment so that future generations can also meet their needs. 
     
  • Balancing Three Pillars:
    Sustainability often involves considering the environmental, economic, and social dimensions of issues, ensuring a holistic approach. 
     
  • Resource Efficiency:
    It emphasizes using resources wisely and minimizing waste to reduce environmental impact.