Ultraviolet radiationUltraviolet (UV) light is electromagnetic radiation with a wavelength from 400 nm to 10 nm, shorter than that of visible light but longer than X-rays. In humans, excessive exposure to all bands of UV radiation can result in chronic harmful effects on the skin, eye, and immune system.
UNCEDThe United Nations Conference on Environment and Development (UNCED), also known as the Rio Summit, Rio Conference, and Earth was a major United Nations conference held in Rio de Janeiro from 3 to 14 June 1992. The issues addressed included: systematic scrutiny of patterns of production of toxic components, such as lead in gasoline, or poisonous waste including radioactive chemicals, alternative sources of energy to replace the use of fossil fuels which are linked to global climate change, new reliance on public transportation systems in order to reduce vehicle emissions, congestion in cities and the health problems caused by polluted air and smoke and the growing scarcity of water. An important achievement was an agreement on the Climate Change Convention which in turn led to the Kyoto Protocol.
UNDPThe United Nations Development Programme (UNDP) is the United Nations' global development network with headquartered in New York City. UNDP advocates for change and connects countries to knowledge, experience and resources to help people build a better life. It provides expert advice, training, and grant support to developing countries, with increasing emphasis on assistance to the least developed countries.
UNEPUNEP, established in 1972, is the voice for the environment within the United Nations system. UNEP acts as a catalyst, advocate, educator and facilitator to promote the wise use and sustainable development of the global environment. Its work encompasses, Assessing global, regional and national environmental conditions and trends, developing international and national environmental instruments, strengthening institutions for the wise management of the environment.
UNFCCCThe United Nations Framework Convention on Climate Change (UNFCCC) is an international environmental treaty (currently the only international climate policy venue with broad legitimacy, due in part to its virtually universal membership) negotiated at the United Nations Conference on Environment and Development (UNCED), informally known as the Earth Summit, held in Rio de Janeiro from 3 to 14 June 1992. The objective of the treaty is to "stabilize greenhouse gas concentrations in the atmosphere at a level that would prevent dangerous anthropogenic interference with the climate system.
UrbanizationIt is a population shift from rural to urban areas, and the ways in which society adapts to the change. It predominantly results in the physical growth of urban areas, be it horizontal or vertical.
USEPAThe United States Environmental Protection Agency (EPA or sometimes USEPA) is an agency of the U.S. federal government which was created for the purpose of protecting human health and the environment by writing and enforcing regulations based on laws passed by Congress.