When you drive onto the Murphy Warehouse headquarters complex in Minneapolis, home to the corporate offices of the 112-year-old family-owned company and an active warehouse operation, you'll see an area of wildflowers and wetlands in a wedge bordered by driveways and parking. In addition to the aesthetics of the green space, this prairie and stormwater basin pays dividends for the company. "This is the largest business in the city of Minneapolis not to pay a stormwater fee, which would run...