Why should investors care? Ethics, environment, sustainability: investors may want to help fund and invest in a sustainable future. Sustainable meaning ongoing, continuing into the far future.
Ecological economics, or Steady-State economics, is a newer theory of economics, developed by Hermann Daly (and others). More information at: http://www.steadystate.org/ And from the book: Daly, H. and Farley, J., Ecological Economics (Washington, D.C.: Island Press, 2004) It is a proposed economic system for the post-industrial, post-carbon world we are entering.