Environmental laws are considered to be the legal strategies and procedures designed to combat the pollution, abuse, and neglect of air, earth, and water resources. The origins of environmental law link back to ancient Rome. Under ancient Roman law, common resources such as the sea and seashore were held in trust for the use and enjoyment of the general public. The modern scope of environmental law has expanded to all law pertaining to the environment. Although no formal definition of environmental law exists, there is general understanding that its central concern is the impact of human activity on natural communities. They have also been used to enforce scientific standards for human health and enjoyment by regulating the use of air, water, and land. Some of the means of control (the techniques for environmental control through law) include: