While glass buildings continue to rise throughout our cities, the question of their sustainability remains. The market is demanding high glazing percentage for the daylight, views, and marketing potential it provides, which can present a considerable hurdle in promoting energy efficiency in modern buildings. During this session, two speakers with varying views will frame the current debate surrounding the all glass building and its place in energy efficient, sustainable design. Specific examples with different methodologies will be presented. We will see if it is possible for the design community as a whole to align on a viewpoint relative to glass and sustainability, so a clear message can be unilaterally conveyed to the broader market.