Investment in infrastructure is essential for long-term and sustainable economic growth. As the world’s population increases from about 7 billion today to over 9 billion in 2050, global infrastructure funding needs will grow significantly. At the same time, choices made today about the characteristics of new infrastructure projects will have significant long-term impacts on the environment, both locally and globally. For example, investing in a coal-fired power plant with a life of 50 to 60 years can “lock in” patterns of future greenhouse gas emissions for decades to come. The International Energy Agency (IEA) suggests that 80% of projected global CO2 energy emissions to 2020 are already locked-in through the world’s current infrastructure asset base.