Científicos comentan sobre el cambio climático
 
PLANETA TIERRA: NUESTRO QUERIDO HOGAR Desapareciendo ante nuestros ojos: el grave estado del hielo ártico   
Play with windows media
( 42 MB )


HOST: Concerned viewers, welcome to this week’s edition of Planet Earth: Our Loving Home, featuring our program on the state of Arctic sea ice and glaciers. The Arctic is the polar crown of our planet, yet the ice and snow in this precious area are disappearing at an unprecedented rate due to climate change, which is driven by the production and consumption of animal products.

These destructive practices are the main source for the human-generated greenhouse gases rapidly heating the globe.

Today we’ll examine how the beautiful but fragile northern polar region is vital to life on our Earth and how it affects weather and climate. One way in which the Arctic plays a key role in regulating global temperatures is through the ice-albedo effect, by which the area’s ancient layer of snow and sea ice reflects 85 to 90% of the Sun’s energy back into space, keeping our planet cool.

Hence, the more ice and snow that are present in the region, the cooler our Earth becomes.  
However when this cover disappears, the opposite effect occurs, as the dark, Arctic Ocean and exposed Arctic land absorb the Sun’s energy and cause planetary warming, which in turn drives more melting and more exposure of these non-reflective surfaces.

Oceanographer Dr. James Overland of the US National Oceanic and Atmospheric Administration’s Pacific Marine Environmental Laboratory directs research on this phenomenon and will now provide more details.

James(m): Without ice there to reflect the summer sunlight from the white ice, we absorb a whole lot more heat from the Sun that the Earth normally used to not get, and that heat is returned to the atmosphere in the fall, and that helps set up these highly variable climate patterns.


For more details on the scientists featured in today’s program, please visit the following respective websites:
Dr. David Barber
www.UManitoba.ca
Dr. James Hansen
www.GISS.NASA.gov
Professor Anders Levermann
www.PIK-Potsdam.de
Dr. James Overland


Vínculos Relacionados
 
PLANETA TIERRA: NUESTRO QUERIDO HOGAR Veli Albert Kallio: El vínculo entre los glaciares en retroceso y los desastres naturales
Play with windows media
 
PLANETA TIERRA: NUESTRO QUERIDO HOGAR El mundo cero en carbono del Dr. Peter Carter
Play with windows media
 
PLANETA TIERRA: NUESTRO QUERIDO HOGAR Dr. John Church: Sonando la alarma del aumento del nivel del mar
Play with windows media
 
PLANETA TIERRA: NUESTRO QUERIDO HOGAR Dr. Peter Raven sobre la crisis de la biodiversidad del planeta
Play with windows media
 
PLANETA TIERRA: NUESTRO QUERIDO HOGAR “Más allá de los 4 grados” Evaluación del cambio climático del Dr. David Karoly
Play with windows media




Carne =