It’s that time of year: Leaves are changing to dazzling yellows, burnt oranges and deep red colors. But why?
NewsHour Science gives us a refresher course — and what warmer temperatures may do to this fall tradition here.
(Photo by Flickr user Tom Olliver.)

It’s that time of year: Leaves are changing to dazzling yellows, burnt oranges and deep red colors. But why?

NewsHour Science gives us a refresher course — and what warmer temperatures may do to this fall tradition here.

(Photo by Flickr user Tom Olliver.)