Lars H. Smedsrud, investigador del hielo, responde en la página web del Bjernes Centre for Climate Research a los niños que le preguntan sobre el cambio climático y sus efectos sobre el ártico y el resto del mundo. Aquí transcribo una de las preguntas.

Question: How is the Artik melting.

Answer: The Arctic Ocean sea ice cover partly melts and re-freeze every summer and winter. Now the ice cover is shrinking, and the most likely heat source is increased transport of heat from the south and more clouds sending down more long-wave radiation. This slow increase over 10-30 years is likely connected to global warming.