When Colorado's largest polluter spewed gases into the air this weekend, the state warned people to stay inside. That kind of warning is rare, but the Suncor refinery in Commerce City emitting gases that could make people sick isn't.
Paleontologists can trace climate change through Earth's history by analyzing fossils in Colorado. But they say it's never changed as fast as it is today.
The wildfire smoke that is streaming into Colorado from out of state, is only part of a pollution cocktail creating hazy skies on the Front Range. An air quality alert was in place for the 15th day in a row on Monday.
