The brief, titled ‘Achieving Sustainable Development: the Energy Investment Challenge,’ describes how the GEA examines 60 scenarios, through a combination of policies addressing energy, transportation and technology, and considers: three demand and supply energy paths; two transport modes (continued reliance on traditional or adopting advanced technologies and fuels; and ten technology portfolios defined by technology access). The brief explains that a sustainable path must: provide universal access to modern energy; ensure good air quality to the majority of the world’s population; contain average global temperature rise to below 2ºC; limit energy trade and enhance energy supply diversity and resilience; and prioritize policies that promote energy efficiency.