1-Definición de medio ambiente.
Se entiende por medio ambiente al entorno que afecta y condiciona especialmente las circunstancias de vida de las personas o la sociedad en su vida.
2-Causas:
-La eliminación de seres vivos al sobreexplotar los recursos naturales (pesca, caza, agricultura intensiva, sobrepastoreo...).
-La eliminación de los hábitats naturales de ciertas especies por urbanismo o construcción de carreteras.
-La destrucción de los recursos al fabricar objetos como papel, herramientas, materiales de construcción...
-La contaminación de los hábitats y los recursos alimentarios de seres vivos.
-La introducción de especies en hábitats nuevos, que provoca un desequilibrio entre las especies.
-El cambio climático.
-La repoblación forestal con monocultivos de rápido crecimiento.
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