Europe's climate change chief says he is astonished at the positive progress by governments towards a global deal on CO2.
Miguel Arias Cañete said it was "quite astounding" that 149 nations have published their plans to curb carbon emissions.
He told BBC News that even six months ago he would not have believed such commitments would emerge.
Nations have been announcing plans ahead of the Paris climate summit.
He warned, though, that nations' pledges had not yet reached the level needed to prevent potentially dangerous warming.