Natural Capital

One of at least four forms of capital used by people, organizations, corporations, and governments, to build and maintain their livelihoods. Natural Capital includes all forms of resources from the environment, including minerals, water, air, sunlight, heat, plants, animals, and other organic matter. Sustainable organizations seek to maximize their effectiveness and efficiency in using natural capital as well as practice policies that sustain the quality and quantity of natural capital sources in the future.
These four forms of capital are described, in detail, in the book Natural Capitalism.