Wildfires across the US are changing forest landscapes — and the tipping point may be on the horizon

As Monica Turner trekked across the western hills of Yellowstone National Park, the cold rain was inescapable. Even the constant movement of putting one foot in front of the other as she fought through a slew of dense branches could not warm her body. It was easy to forget it was July.

​ As Monica Turner trekked across the western hills of Yellowstone National Park, the cold rain was inescapable. Even the constant movement of putting one foot in front of the other as she fought through a slew of dense branches could not warm her body. It was easy to forget it was July. Read More Breaking News, Latest News and Videos | CNN