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La extinción suele ser un término que asusta a casi toda la humanidad. Muchas veces se ha hablado del posible fin del mundo ante las diversas condiciones que afectan al planeta Tierra con el paso de los años. Pero es que, a lo largo de su existencia, el planeta ha pasado por cinco extinciones masiva, que, según el astrónomo Germán Puerta, en diálogo con Bla Bla Blu, podrían volverse a dar.
El ordovícico: hace aproximadamente 450 millones de años, esta extinción resultó en la desaparición del 60 % de las especies marinas. Las causas aún se debaten, pero se cree que el enfriamiento global y las glaciaciones jugaron un papel fundamental.
El devónico: aproximadamente 390 millones de años atrás, el 83 % de las especies marinas desaparecieron debido a cambios climáticos severos, entre otros factores como la reducción de la capa de ozono.
La gran mortandad: hace 250 millones de años, esta extinción es considerada como la más devastadora, con un 95 % de las especies desaparecidas, posiblemente provocada por una serie de masivas erupciones volcánicas.
La del Jurásico: aproximadamente 200 millones de años atrás, el 75 % de las especies se extinguieron, concediendo un dominio absoluto a los dinosaurios gracias a eventos volcánicos y variados factores ambientales.
La de los dinosaurios: conocida por la extinción de los dinosaurios hace 65 millones de años, este evento fue causado por el impacto de un asteroide en la península de Yucatán. La velocidad y energía liberada fueron letales para muchas especies.
Escuche la reflexión de las extinciones con Germán Puerta:
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