Sustainability Triangle: Economy–Environment–Society Dynamics

Sustainability is often described as a triangle balancing economic development, environmental protection and social equity — but the three pillars are not independent, they are coupled feedback loops. This simulator models them as three nonlinear stocks (Economic Capital, Environmental Capital, Social Equity) evolving under a system-dynamics-style ODE system, and renders their joint state as a live trajectory through a 3D phase space. Tune how aggressively the economy extracts from the environment, how fast the environment regenerates, and how much of that growth is reinvested into social equity, then trigger a resource shock to see whether the system's own feedback loops restore balance or tip it toward collapse — tracked live by a weakest-link sustainability index, since a triangle is only as strong as its weakest side.