The profound lack of sustainable systems on our planet is of great concern to environmentalists, some of who are educators and some of who are permaculturists.
Many of the problems facing Earth and its inhabitants are caused by a lack of ecological literacy among much of the human population. Ecological literacy includes an understanding of the scientific principles of ecology, including the recognition of limits and possibilities. It also includes an attitude of care toward the environment and a commitment to act. Finally, it requires the ability to recognize interconnectedness; what some people call systems thinking.