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Most greywaters are much easier to treat and recycle than blackwaters, due to their lower levels of contamination. However, entirely untreated greywater is still considered to be a potential health and ...
... may be considered "dark grey" or blackwater.   In recent years concerns over dwindling reserves of groundwater and overloaded or costly sewage treatment plants has generated much interest in the reuse ...
... on-site renewable energy.   Green building materials Building materials typically considered to be ''green'' include rapidly renewable plant materials like bamboo and straw, lumber from forests certified ...
... Malthusian catastrophe), while John Stuart Mill hypothesized that the "stationary state" of an economy might be something that could be considered desirable, anticipating later insights of modern ecological ...
... devices may be considered as well. Individual features include sawtooth roofs, clerestory windows, light shelves, skylights and light tubes. They may be incorporated into existing structures, but are most ...
... rows and the mixing of plant varieties can improve crop yields. While sunlight is generally considered a plentiful resource, the exceptions highlight the importance of solar energy to agriculture. During ...
... the position of a building to the Sun. Active solar technologies increase the supply of energy and are considered supply side technologies, while passive solar technologies reduce the need for alternate ...
... computers) and plastics. Though similar, the composting of biodegradable waste – such as food or garden waste – is not typically considered recycling. These materials are either brought to a collection ...
Taxonomy by Zaragoza Online