Video: Meteorologist Discusses Why 2015 Was Warmest Year on Record
Extreme weather conditions are affecting areas across the globe. Are they a result of global warming? Dr. Alexander Hildebrand, a meteorologist from the German weather service wetter.com, provides some answers.
http://www.dw.com/en/2015-is-the-warmest-year-on-record/av-18952223
William Straka, UWM/NASA/NOAA