Everyone has the right to a healthy environment protected for present and future generations through reasonable legislative measures that prevent pollution and promote conservation and sustainable development. Environmental impact assessments originally focused on ecology and physical impacts but now also consider social analysis, sustainable development, and biodiversity. Loss of habitats, overexploitation of resources, invasive species, pollution, climate change, and other issues threaten the environment. Environmental management systems provide a structured, iterative process for optimal decision making and reducing uncertainty over time through monitoring.