UN and YouTube host a one-hour debate on just days about climate change challenge . Debate will air live on CNN.com , and later on CNN . Comes just days before the end of the Copenhagen summit on climate change in Copenhagen . On December 15 , CNN joins forces with YouTube to host a global debate on the environmental challenges facing our planet . World leaders are seeking a global agreement to reduce carbon emissions .
UN and YouTube host a one-hour debate on just days about climate change challenge . Debate will air live on CNN.com , and later on CNN . Comes just days before the end of the Copenhagen summit on climate change in Copenhagen . World leaders are seeking a global agreement to reduce carbon emissions .