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• Biosfera
  That part of the earth, and the atmosphere surrounding it, which is able to support life.
• Contaminaci?n
• Control biol?gico
  Control of undesirable insects, plants or animals by the introduction of predators, parasites, or diseases.
• Crisis ecol?gica
• Desastre causado por el hombre
• Ecolog?a humana
• Equilibrio ecol?gico
• Medio ambiente natural
• Urbanizaci?n
  Population concentration in urban areas as a result of rural migration or due to an increase in the number of urban areas. Do not confuse with "urban development".