This analogy is simply the framework for sustainable development.
As conceived, sustainable development is an environmental circle. Inside the circle, we want societies to prosper so that people can live their lives with dignity; and inside this circle, there's the economic circle. As we ensure that we have societies that live with dignity in a healthy environment, we can create wealth. By placing this in a triangle, conversely, we always have to find a compromise for jobs, for the economy relative to the environment.
Does this lead us to a win-win situation? The answer is that it leads us to the erosion of biodiversity that we're seeing now.