To lessen congestion in the streets;

To secure safety from fires, panic and other dangers;

To promote health and the general welfare;

To provide adequate light and air;

To prevent the overcrowding of land;

To avoid undue concentration of population;

To facilitate the adequate provision of transportation, solid waste facilities, water, sewerage, schools, parks, child day care;

To assure proper use of natural resources and other public requirements;

To encourage the preservation of agricultural lands and buildings; and

To encourage the installation and use of solar, wind, or other renewable energy systems and protect access to energy sources by the regulation of orientation of streets, lots, and buildings; establishment of maximum building height, minimum setback requirements, and limitations on type, height, and placement of vegetation; and encouragement of the use of solar skyspace easements under RSA Ch. 477.