The precautionary principle is a pro-active measure to ensure that substances, processes and activities which are harmful to the environment are prevented from entering the environment. This is to ensure that costly subsequent restoration is avoided and that irreversible environmental degradation is avoided. Adverse effects include, but are not limited to: toxicity, bioaccumulation, bioconcentration, persistence, depletion of the stratospheric ozone layer, reduction of carbon sinks, increased greenhouse gases, increased human-induced climate change, reduction or loss of biodiversity, as well as heat, light and electro-magnetic radiation, atomic radiation, and hormone mimicry.Every proponent of an intervention in the ecosystem must demonstrate that the intervention will not cause harm to the environment or will not create ecologically unsound wastes.