¿Por qué The Guardian está poniendo los niveles globales de CO2 en el pronóstico del tiempo?

A medida que los niveles de CO 2 aumentan, el conteo de carbono es un recordatorio diario que debemos abordar el cambio climático ahora

La medida más simple de cómo la quema masiva de combustibles fósiles está perturbando el clima estable en el que se desarrolló la civilización humana es el número de moléculas de dióxido de carbono en la atmósfera.

Hoy en día, el nivel de CO 2 es el más alto desde hace varios millones de años. En aquel entonces, las temperaturas eran 3-4 ° C más altas, el nivel del mar era 15-20 metros más alto y los árboles crecían en el polo sur . Peor aún, miles de millones de toneladas de contaminación por carbono continúan vertiéndose en el aire cada año ya una velocidad 10 veces más rápida que durante 66 millones de años.

En los albores de la revolución industrial, el CO 2 estaba en 280 partes por millón (ppm) en la atmósfera. Para 1958, cuando se hicieron las primeras mediciones en Mauna Loa en Hawai, había alcanzado 315 ppm. Corrió más allá de 350 ppm en 1986 y 400 ppm en 2013 .

The Guardian ahora publicará el conteo de carbono de Mauna Loa , el punto de referencia global, en la página del tiempo del periódico todos los días.

"Cuando leí la carta del lector de The Guardian, Daniel Scharf, que nos alentaba a incluir información sobre el cambio climático en nuestras previsiones meteorológicas, pensamos que era una idea fantástica", dijo la editora en jefe de The Guardian, Katharine Viner.

“Los niveles de dióxido de carbono en la atmósfera han aumentado tan dramáticamente, e incluir una medida de eso en nuestro informe meteorológico diario es simbólico de lo que la actividad humana está haciendo con nuestro clima. La gente necesita recordar que la crisis climática ya no es un problema futuro, debemos enfrentarla ahora y todos los días son importantes ".

La última vez que los niveles de CO2 fueron tan altos, hubo árboles en el Polo Sur.

Si bien el clima cambia a diario, el clima cambia a lo largo de años y décadas. Así que, junto con el recuento diario de carbono, publicaremos el nivel en años anteriores para comparación, así como la línea de base preindustrial de 280 ppm, y el nivel considerado como manejable a largo plazo de 350 ppm.

Las comparaciones de un año a otro son importantes porque cada año hay un aumento natural y una caída de los niveles de CO 2 , como la respiración del planeta. Los árboles y las plantas absorben el carbono y liberan oxígeno a medida que crecen, reduciendo el CO 2 atmosférico .

Como la mayoría de las plantas se encuentran en el hemisferio norte, el CO 2 alcanza su nivel más bajo cada año al final de la temporada de crecimiento en octubre. Luego comienza a elevarse a medida que las plantas moribundas se deterioran, alcanzando un máximo en mayo o junio.

Si bien el nivel de CO 2 es una medida importante y simbólica del calentamiento global causado por la humanidad, es simple. Los aumentos de temperatura que experimenta el mundo, y las olas de calor, las tormentas y las sequías que se producen también dependen de la rapidez con que aumentan o disminuyan las emisiones y del tiempo que permanezcan en niveles altos. El nivel de 350 ppm fue propuesto en 2008 por el profesor James Hansen de la NASA como un objetivo adecuado.

Sin embargo, si medimos el cambio climático, una cosa está clara: para mantener el calentamiento por debajo de 1.5 ° C, la aspiración de las naciones del mundo, debemos reducir a la mitad las emisiones para 2030 y llegar a cero a mediados de siglo. También es probable que tengamos que eliminar el CO 2 de la atmósfera, tal vez mediante la restauración a gran escala de la naturaleza .

Es una tarea enorme, pero esperamos que el seguimiento del aumento diario de CO 2 ayude a mantener la atención en él. Cuando se superó el hito de 400 ppm, el profesor Ralph Keeling, quien supervisa las mediciones de Mauna Loa iniciadas por su padre, dijo: "Es simbólico, un punto para detenerse y pensar en dónde hemos estado y hacia dónde vamos".

Mauna loa

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