UN Secretary General Ban Ki-moon has appointed environmental expert Janos Pasztor of Hungary as his top adviser on climate change. Pasztor takes up a mandate to help promote agreement at a meeting in Paris in December where a landmark pact is intended to be adopted, AP reported. U.N. spokesman Stephane Dujarric said Friday that Pasztor will support efforts to get governments to reach a universal climate agreement that keeps global warming from reaching dangerous levels. He will have the rank of assistant secretary-general. Pasztor currently holds a top post at World Wildlife Fund International. He served on the secretary-general's panel on global sustainability from 2011 to 2012 and has worked for the U.N. Environment Program and the U.N. Framework Convention on Climate Change.