‘It felt like the apocalypse’: Colorado wildfires destroyed hundreds of homes.

Wildfires in the American West have been worsening — growing larger, spreading faster and reaching into mountainous elevations that were once too wet and cool to have supported fierce fires. What was once a seasonal phenomenon has become a year-round menace, with fires burning later into the fall and into the winter.

Recent research has suggested that heat and dryness associated with global warming are major reasons for the increase in bigger and stronger fires, as rainfall patterns have been disrupted, snow melts earlier and meadows and forests are scorched into kindling.