Ahead of the Global Clean Energy Action Forum, a joint convening of the 13th Clean Energy Ministerial and 7th Mission Innovation Ministerial in Pittsburgh, Pennsylvania this September, Nature Energy spoke with three members of the Mission Innovation Steering Committee — Drew Leyburne, MI Steering Committee Chair and Assistant Deputy Minister, Energy Efficiency and Technology Sector, Natural Resources Canada; Julie Cerqueira, incoming MI Steering Committee Chair and Principal Deputy Assistant Secretary, Office of International Affairs, US Department of Energy; Rosalinde van der Vlies, Vice-Chair of the MI Steering Committee and Director, Clean Planet Directorate in the Directorate-General for Research and Innovation for the European Commission — to hear their thoughts about the next phase of clean energy technology development.