IEA (2021), Technology areas in advanced economy clean energy start-up deals at different funding stages by share of deal count, 2019-2020, IEA, Paris https://www.iea.org/data-and-statistics/charts/technology-areas-in-advanced-economy-clean-energy-start-up-deals-at-different-funding-stages-by-share-of-deal-count-2019-2020, Licence: CC BY 4.0