La cantidad de hielo que rodea alaAntártida ha crecido en los últimos años en lo que los expertos consideran un posible efecto colateral del cambio climático. Por el contrario, el Ártico sigue perdidendo superficie helada a un ritmo alarmante.
En pleno invierno del hemisferio sur, cuando los pingüinos emperador seamontonan para hacer frente a las bajísimas temperaturas del polo, la masa heladade la Antártida no para de crecer, de forma lenta pero constante,desde la década de los 70. Según los expertos, las causas podrían derivarse del cambio climático y sus repercusiones en los vientos, las corrientes marinas o las nevadas.
Desde finales de los 70, "la superficie de hielo en la Antártica ha aumentado durante el invierno a un ritmo de un 0,6% por década" enrte entre 1979 y 2006, explica Donald Cavalieri, científico de Centro Espacial Goddard de la NASA.
Sus 19 millones de metros cuadrados casi alcanzan el récord de la década de los 70, en que se alcanzó una superficie de 20 millones de metros cuadrados. También ha aumentado el promedio de la extensión de hielo durante todo el año.
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