CNN and YouTube host a one - hour debate on December 11 about climate change challenge . On December 15 , CNN joins forces with YouTube to host a global debate on the environmental challenges facing our planet . Debate will air live on CNN.com , and later on CNN International . Comes just days before the end of the UN conference on climate change in Copenhagen . World leaders are negotiating a global agreement to reduce carbon emissions .
CNN and YouTube host a one - hour debate on December 11 about climate change challenge . Debate will air live on CNN.com , and later on CNN International . Comes just days before the end of the UN conference on climate change in Copenhagen . World leaders are negotiating a global agreement to reduce carbon emissions .