18 countries and over 60 organizations launched the Global Alliance for Buildings and Construction at COP21 to reduce emissions and increase climate resilience in the building sector. The Alliance aims to speed up and scale efforts by the built environment industry to design and construct in a way that reduces emissions by 84 gigatons of CO2 by 2050. While this is an encouraging step, some note it may still not be enough to limit global warming to 1.5-2 degrees Celsius and that all built environment players must collaborate on sustainability strategies focused on this goal.