Aluminum window frames with thermal breaks will eliminate this problem. They are actually made of two separate frames, an inner frame and an outer frame, fused together with a material that will not conduct heat. In most climates in the United States, windows should have multiple glazing because the trapped air in the space between the panes reduces heat loss in winter and heat gain in the summer. Two thin air spaces insulate better than one thicker space. Besides saving energy, low E coatings also block the transmission of the ultraviolet portion of sunlight that can cause fabrics to fade or deteriorate.
Some windows contain plastic films between the panes rather than extra pieces of glass.
The films can increase energy efficiency because they form multiple air spaces, and the plastic is sealed well enough so that it shouldn't pose a problem from an outgassing standpoint. The plastic films are used because they are lighter in weight than glass and they can have a low E coating applied to them. A few manufacturers are filling the space between the window panes with argon because it will reduce heat loss when compared to an air filled window. As long as the argon remains in the window, it should cause no problems. However, even if it did leak out, it is doubtful if it would have a negative affect on either people or the planet because argon is chemically inert and naturally occurring in the atmosphere.