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Global Climate Change01:50

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Throughout its ~4.5 billion year history, the Earth has experienced periods of warming and cooling. However, the current drastic increase in global temperatures is well outside of the Earth’s cyclic norms, and evidence for human-caused global climate change is compelling. Paleoclimatology, the study of ancient climate conditions, provides ample evidence for human-caused global climate change by comparing recent conditions with those in the past.
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Se acerca un cambio de estado en la biosfera de la Tierra.

Anthony D Barnosky1, Elizabeth A Hadly, Jordi Bascompte

  • 1Department of Integrative Biology, University of California, Berkeley, California 94720, USA. barnosky@berkeley.edu

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|June 9, 2012
PubMed
Resumen

El ecosistema global puede estar acercándose a un punto de inflexión a escala planetaria debido a las actividades humanas. Las señales de alerta temprana y abordar el impacto humano son cruciales para la predicción biológica y la prevención de cambios irreversibles.

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Área de la Ciencia:

  • Ecología Ecología Ecología.
  • Ciencias ambientales Ciencias ambientales.
  • Ciencias del clima Ciencias del clima Ciencias del clima Ciencias del clima

Sus antecedentes:

  • Los sistemas ecológicos exhiben cambios abruptos e irreversibles a través de umbrales críticos.
  • Las actividades humanas están forzando cada vez más cambios biológicos globales.

Objetivo del estudio:

  • Para revisar la evidencia de una transición crítica a escala planetaria en el ecosistema global.
  • Para resaltar la necesidad de mejorar la predicción biológica y los sistemas de alerta temprana.
  • Abordar las causas profundas de los cambios ambientales inducidos por el hombre.

Principales métodos:

  • Revisión de la literatura científica existente sobre los umbrales ecológicos y los puntos de inflexión.
  • Análisis de la evidencia de las respuestas de los ecosistemas globales a la influencia humana.
  • Discusión de las señales de alerta temprana y los mecanismos de retroalimentación.

Principales resultados:

  • La evidencia sugiere que el ecosistema global puede estar acercándose a una transición crítica, análoga a los puntos de inflexión localizados.
  • Los puntos de inflexión a escala planetaria son plausibles debido a las presiones humanas acumuladas.
  • Es esencial identificar las señales de alerta temprana y comprender los circuitos de retroalimentación.

Conclusiones:

  • El potencial del ecosistema global para experimentar una transición crítica requiere una atención urgente.
  • La mejora de las previsiones biológicas requiere la detección de señales de alerta temprana globales y locales.
  • Abordar las causas profundas del impacto humano es vital para mitigar los riesgos de un cambio global irreversible.