Green building is a resource-efficient method of construction that produces healthier buildings which have less impact on the environment and cost less to maintain.
A natural material is any product or physical matter that comes from plants, animals, or the ground. Minerals and the metals that can be extracted from them.
Environmental issues are defined as problems with the planet's systems like air, water, soil, that have developed as a result of human interference or mistreatment of the planet.
Eco-friendly, or ecological, construction is building a structure that is beneficial or non-harmful to the environment, and resource efficient.
Alternative energy is any energy source that does not use fossil fuels like coal, gasoline and natural gas. Renewable energy comes from natural sources that don't run out.