Green roof collapse at St. Charles company due to ice, snow buildup. - chicagotribune.com

The 256,000-square-foot Aquascape Inc. warehouse featured the "largest sloping green roof in North America," according to the company's website.

On Sunday, a section of the roof that ran the length of the building and extended over a parking lot collapsed at the pond construction and supply company. The section appeared to be about 50 feet wide.