Probably more so with clean industries than office towers. Even clean industries produce some kind of waste that would be considered harmful in some respect to the the environment. Incinerators and chemical plants are notorious for their polluting contaminants that were dumped unchecked for decades. Before the Clean Air Act and the Clean Water Act placed restrictions and limitations on the amount of contaminants, our skies and waterways were headed for certain doom. Incinerators now reclaim a good portion of the combusted waste they produce, much of which is injected into deep wells below the Earths surface. Chemical plants have to neutralize and treat their waste products. If they do not meet federal standards, they must be contained in holding facilities, rather than released into the existing water supply.