The global energy sector will need to invest half of current world gross domestic product over the next two decades in order to address a number of critical issues and expand and adapt the energy infrastructure, the London-based World Energy Council (WEC) says in its recently released World Energy Issues Monitor. Here are the most pressing issues affecting three regions. The top-left quadrant of each regional map represents issues of high uncertainty and high impact; the top-right quadrant covers issues of high impact but of higher certainty—things that keep energy leaders busy. The bottom-left quadrant represents issues of perceived lesser importance (or those that are poorly understood), and the bottom-right quadrant presents issues of low impact and high certainty. Bubbles are proportional to the urgency of an issue. Source: WEC (

–Copy and artwork by Sonal Patel, senior writer