Amareleja (Portuguese pronunciation: [ɐmɐɾɨˈleʒɐ] or [ɐmɐɾɨˈlɐiʒɐ]) is a Portuguese civil parish of the municipality of Moura, in the district of Beja. In 2001, the population was 2763 inhabitants, in an area of 108.56 square kilometres (41.92 sq mi) in area and is one of the hottest places in Europe during the summer (record high 47.4 °C (117.3 °F)).
Archeological vestiges from the Roman epoch are found in the north of the village until the margins of the River Ardila, but they suggest the fields of Amaraleja were occupied by various generations during the pre-history of the region. Antas (dolmens), burial tombs, wall paintings, flint implements, vestiges of metal smelting and Bronze Age tombs (carved into the hills) have been discovered by farmers or during road construction. Roman remnants include the pavements of buildings, circular burial tombs with bowls and fragments of bone, coins with the inscriptions of Emperor Claudius, roof tile, masonry and milling stones. In Barranco de Valtamujo there remains of a Roman bridge, that possibly connect to another along the Ardila River, and near the port of Castelo. This bridge provided a daily crossing for the residents along the margins of the Vale de Navarro, which is known for having many vestiges from antiquity.
Sustainable energy is the sustainable provision of energy that meets the needs of the present without compromising the ability of future generations to meet their needs. Technologies that promote sustainable energy include renewable energy sources, such as hydroelectricity, solar energy, wind energy, wave power, geothermal energy, and tidal power, and also technologies designed to improve energy efficiency.
Energy efficiency and renewable energy are said to be the twin pillars of sustainable energy. Some ways in which sustainable energy has been defined are:
This sets sustainable energy apart from other renewable energy terminology such as alternative energy and green energy, by focusing on the ability of an energy source to continue providing energy. Sustainable energy can produce some pollution of the environment, as long as it is not sufficient to prohibit heavy use of the source for an indefinite amount of time. Sustainable energy is also distinct from low-carbon energy, which is sustainable only in the sense that it does not add to the CO2 in the atmosphere.
Green Energy is energy that can be extracted, generated, and/or consumed without any significant negative impact to the environment. The planet has a natural capability to recover which means pollution that does not go beyond that capability can still be termed green.