This document discusses the conservation of natural resources. It defines the biosphere as the regions of earth and atmosphere occupied by living things, including the lithosphere, hydrosphere, and atmosphere. Natural resources are classified as either renewable or non-renewable. Renewable resources like water, air, soil can replenish within a reasonable time while non-renewable resources like fossil fuels cannot replenish. The document stresses the importance of conserving both renewable and non-renewable natural resources and using sustainable alternatives like solar and wind energy to protect resources for future generations.