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They are primarily either undergraduate only institutions (e.g. liberal arts colleges), or the undergraduate institution of a university (such as Harvard College, Yale College, and Columbia College). Higher education has led to the creation of accreditation organizations, independent of the government, to vouch for the quality of degrees. These ...
Human impact on the environment. From top left, clockwise: satellite image of Southeast Asian haze; IAEA experts investigate the Fukushima disaster; a seabird during an oil spill; depiction of deforestation of Brazil's Atlantic forest by Portuguese settlers, c. 1820 –25; acid mine drainage in the Rio Tinto; industrial fishing in 1997, a practice that has led to overfishing.